# what is the number of each atom in the unit cell of a BCC cystalline structure unit cell. I know its 2 atoms=8/8 +1 Calculate what % of each atom is contained within the unit cell? How do I do

49,135 questions
1. ## math

what is the number of each atom in the unit cell of a BCC cystalline structure unit cell. I know its 2 atoms=8/8 +1 Calculate what % of each atom is contained within the unit cell? How do I do this

asked by Anonymous on January 13, 2010
2. ## chemistry

Is the calculation of percentage of each atom within a Body centered cubic cell AKA volume of the BCC cell same as the atomic packing factor for the BCC unit cell. The BCC % is 68%. the atomic packing factor is just 0.68. Am I completely wrong? And also

asked by Anonymous on January 13, 2010
3. ## Chemistry

The element rubidium has bcc packing with a body-centered cubic unit cell. The density of Rb is 1530 kg/m3. Calculate the volume (L) of the unit cell of rubidium. Molar mass of Rb=85.468. Since it is bcc, it would have 2 atoms/unit cell. Can you please

asked by Sidney Ngo on February 8, 2017
4. ## chemistry

This problem is from my chemistry book and I am having a little trouble with the intermediary steps: Barium metal crystallizes in a body- centered cubic lattice (atoms at lattice points only) The unit cell edge length is 502 pm, and the density of the

asked by Tokey on May 18, 2010
5. ## Chemistry

The density of iridium is 22400 kg/m3 and the cell volume is 5.66 x 10-23 cm3. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number. The molar mass of iridium is 192.22. I know that this can either be a

asked by Sidney Ngo on February 8, 2017
6. ## Chemistry

Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find

asked by Kyle on January 16, 2013
7. ## Chemistry

Calculate the radius of a vanadium atom, given that V has a BCC crystal structure, a density of 5.96 g/cm3, and an atomic weight of 50.9 g/mol. I used this equation: density = (2)*(atomic weight) / (volume of unit cell)*(Avagodro's #) rearranged to find

asked by Kyle on January 16, 2013
8. ## Chemistry

Find the unit cell (simple, bcc, fcc), type of holes where the smaller ions are found (tetrahedral, octrahedral, cubic), and number of cations and anions per unit cell for the following compounds: CdSe CsI Li2O KBr NaCl ZnS(I) i did this and i got most of

asked by kooler on February 15, 2010
9. ## Chem

Based on the number of atoms per unit cell and the mass of the atom, the mass of the unit cell can be calculated. The density of the unit cell and the material as a whole can be determined from the mass and the volume of the unit cell as. D= M/V The usual

asked by Juliee on January 16, 2009
10. ## chemistry

Find the unit cell (simple, bcc, fcc), type of holes where the smaller ions are found (tetrahedral, octrahedral, cubic), and number of cations and anions per unit cell for the following compounds: CdSe CsI Li2O KBr NaCl ZnS(I)

asked by jina on February 12, 2008
11. ## Science: Chemistry

1. The element gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell? (b) What are the # of unit cells in 1 mol? (c) What is the volume of 1 mol gold unit cells? (d) What is the volume of 1

asked by Supriya on November 8, 2014
12. ## Chemistry

1. The eleent gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell? (b) What are the # of unit cells in 1 mol? (c) What is the volume of 1 mol gold unit cells? (d) What is the volume of 1

asked by Supriya on November 8, 2014
13. ## Chemistry

An element has bcc packing with a body-centered cubic unit cell. Its density is 19300 kg/m3 and the unit cell volume is 3.17 x 10-26 L. Calculate the molar mass (g/mol) of the element to three significant figures. The element rubidium has bcc packing with

asked by Dan on February 8, 2010
14. ## Chemistry

The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: a)the coordination number of Li and S b) the number of formula nunits in the unit cell c) the density of Li2S

asked by Erica on April 15, 2009
15. ## math

an element has a BCC structure with cell edge of 288pm. the density of the element is 7.2g/cm3. how many atom are present in 208g of the element?

16. ## chemistry

The element K has bcc packing with a body-centered cubic unit cell. The density of K is 0.862 g/mL. Calculate the volume (L) of the unit cell of K.

asked by tweety on February 21, 2009
17. ## Chemistry

The density of palladium (Pd) is 12.0 g/mL and the cell volume is 5.89 ✕ 10^−23 mL. Determine the number of atoms in the unit cell. (Because there cannot be a part of an atom in a unit cell, we must round the number of atoms to the nearest whole

asked by James on July 16, 2017
18. ## chemistry

The element Rb has bcc packing with a body-centered cubic unit cell. The density of Rb is 1.532 g/cm3 and the cell volume is 1.852 x 10-22 mL. Calculate the value of Avogadro's number to three significant figures based on these data.

asked by tweety on February 21, 2009
19. ## chemistry

Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at ½, ¼, 0; draw a unit cell - it helps.)

20. ## chemistry

Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at ½, ¼, 0; draw a unit cell - it helps.)

21. ## Chemistry

The element niobium has bcc packing with a body-centered cubic unit cell. The volume of the unit cell is 3.59 x 10-26 L. Calculate the density (g/cm3) of the element

asked by Anon on May 12, 2010
22. ## chemistry

The element lithium has bcc packing with a body-centered cubic unit cell. The volume of the unit cell is 4.32 x 10-26 L. Calculate the density (g/cm3) of the element.

asked by tweety on February 21, 2009
23. ## chemistry

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is

asked by ali on February 19, 2012
24. ## engineering

Sketch one face of a simple cubic unit cell of side a for the case when the maximum fraction of the lattice in volume is filled with atoms, and each atom is approximated by a hard sphere. (ii) What is the radius of each atom in terms of a? (iii) What is

asked by ali on February 19, 2012
25. ## Chemistry

The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: (I could not paste the actual picture from the assignment here, but if you go to Google Image and type in "crystal

asked by Erica on April 14, 2009
26. ## chemistry

Determine the radius of the largest atom that can be accommodated in the interstices of BCC iron (Fe) without stress. (Hint: the center of the largest site is at ½, ¼, 0; draw a unit cell - it helps.) Radius (in centimeters):

27. ## General Chemistry

PLEASE ANSWER VERY SOON I AM STUCK! Crystalline silicon has a cubic structure. The unit cell edge length is 543 pm. The density of the solid is 2.33 g/cm3. Calculate the number of Si atoms in one unit cell.

asked by Kendra on July 14, 2010
28. ## chemistry

how do i calculate the volume of a unit cell and volume of atoms within a unit cell for FCC and BCC

asked by blasting on February 11, 2010
29. ## chemistry

Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm. What is the radius of a gallium atom? The face-centered gold crystal has an edge length of 407 pm. Based on the unit cell, calculate the density of gold.

asked by ea on November 24, 2008
30. ## Chemistry

Boron Phosphide, BP, is a semiconductor, and a hard, abrasion resistant material. It is made by reacting Boron tribromide and phosphorus tribromide in a hydrogen atmosphere at high temperature (>750 degrees C) (a) Write a Balanced chemical equation for the

asked by Laffy Taffy on March 11, 2012
31. ## Chemistry

1.The density of solid Fe is 7.87 g/cm3. What volume per atom of Fe? 2.As a solid Fe adopts a body centered cubic unit cell. What is the volume of a unit cell of this metal? 3.What is the edge length of a unit cell of Fe?

asked by Josh on July 9, 2011
32. ## chemistry

1)The element nickel has ccp packing with a face-centered cubic unit cell. The density of nickel is 8900 kg/m3 and the cell volume is 4.376 x 10-23 cm3. Calculate the value of Avogadro's number to three significant figures based on these data. (Note: the

asked by blasting on February 4, 2010
33. ## AP chem

I have a problem set due tomorrow, and two problems in it were not covered in class. The first is this: Molybdenum has an atomic radius of 0.145 nm. The volume of its cubic unit cell is 0.0375 nm^3. What is the geometry of the molybdenum unit cell? I have

asked by chris on December 7, 2006
34. ## Chemistry

A mineral that contains iron and sulfur has the cubic unit cell pictured below. What is the empirical formula for this mineral? •Fe atoms are the smaller spheres; one on each corner and one on each face of the unit cell •S atoms are the eight larger

asked by Kara on June 17, 2017
35. ## Chemistry

The radius of a single atom of a generic element X is 199 picometers (pm) and a crystal of X has a unit cell that is face-centered cubic. Calculate the volume of the unit cell.

asked by Cee on May 6, 2017
36. ## chemistry

a metal crystallizes in the face centered cubic crystal structure with a unit cell edge of 5.48 x10 power of -8 cm. the density of the metal is 6.90 g per cubic cm. a. what is the mass (g) of a single atom of this element. b. what is the atomic weight of

asked by amanda on December 4, 2011
37. ## chem

The radius of a single atom of generic element X is 197 picometer(pm) and crystal of X has a unit cell that is face centered cubic calc the volume of the unit cell. Please help and show all work

asked by Jeremiah on February 19, 2018
38. ## Chemistry

What portion of the volume of each atom or ion on the face of a unit cell is actually within the unit cell 1/2 1/4 3/4 all of it none of it

asked by Lauren on February 6, 2008
39. ## Inorganic Chemistry

The atoms in barium metal are arranged in a body centered cubic unit cell. Calculate the radius of a barium atom in A if the density of barium is 3.50g/cm3. The atomic weight of barium is 137.34. The atoms in barium metal are arranged in a body centered

asked by Stephanie on October 15, 2006
40. ## Chemistry

The density of gold is 1.93E4 kg/m3 and the cell volume is 6.78E-26 L. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number. For the purposes of this calculation, enter your answer to 3 significant

asked by Thy on February 4, 2008
41. ## geometry

sodium has a body-centered cubic structure with a unit cell that is 430 picometers wide. estimate the radius of a sodium atom. please help me, I don't know how to get the solution. THank you

asked by lin on January 28, 2013
42. ## chemistry

a metal crystallizes in the face centred cubic cubic crustal structure with a unit cell edge of 5.48 x10 power of -8 cm.the density of the metal is 6.90g per cubic cm. a. what is the mass in grams, of a single atom of this element. b. what is the atomic

asked by amanda on December 4, 2011
43. ## CHEM

Info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube. Atoms can

asked by K on November 29, 2007
44. ## AP chem

Second question: In the LiCl structure shown in 9.18 [LiCl's lattice, where the "Cl- ions are in contact with each other, forming a face centered cubic lattice."], the chloride ions form a face-centered cubic unit cell 0.513 nm on an edge. The ionic radius

asked by chris on December 7, 2006
45. ## CHEM****

Initial info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners of a cube.

asked by K on November 30, 2007
46. ## Urgent Chem help.plz

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide

asked by Julia on January 24, 2009
47. ## Chemistry

The density of cesium is 1870 kg/m3 and the cell volume is 2.23 x 10-22 mL. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number.

asked by Joe Zheng on February 8, 2017
48. ## chemistry

The density of platinum is 21500 kg/m3 and the cell volume is 6.04 x 10-26 L. Determine the number of atoms in the unit cell. Note: the number of atoms in a unit cell is a whole number.

asked by tweety on February 21, 2009
49. ## PNU

An element has a body-centered cubic(bcc) structure with a cell edge of 288pm the density of the element is 7.2g/cm3. How many atoms are present in 208g of element

asked by abeer on February 17, 2015
50. ## chemistry

I have a unit cube question to which the answer is given that I'm trying to figure out. The question is: If under conditions of high pressure & temperature, the crystalline structure rearranges to form a face-centered cubic unit cell, what is the new

asked by unit cubes on July 10, 2011
51. ## chem

The crystal structure of lithium sulfide (Li2S) is pictured here. (Intro 1 figure) The edge length of the unit cell is 5.88*10^2^2 pm. i guess it is FCC ( face cenred cubic) 1-- What are the coordination numbers of and Li^+ and S^2- in the lithium sulfide

asked by Dr Bob plz help on January 24, 2009
52. ## Chem

Pure gold adopts a face-centered cubic crystal structure. It also has a density of 19.30g/mL. What is the edge length of gold's unit cell? What is the atomic radius of gold? I understand how to do this problem the other way: when you have the unit cell and

asked by Em on April 15, 2015
53. ## CHEM

An atom at the face of a unit cell is shared by how many unit cells? 1 2 4 6 8

asked by Hannah on May 4, 2011
54. ## Biology

In this assignment, you will select one of the options that you can compare a cell to and design an analogous development structure. then, you will compare the structure of your development to the organelles of the cell that you have learned about in this

asked by Reina B. on December 5, 2013
55. ## CHEMISTRY

For MgSe, which crstallize structure un the rock salt structure, the unit cell edge is 5.45A. Determine the internuclear distance between neighboring Mg2+ and Se2-, as well as the cation and anion radii.

asked by SARITA on February 23, 2009
56. ## chemistry

The molar volume of a certain form of solid lead is 18cm3/mol. Assuming cubic closest packed structure, determine the number of Pb atoms per unit cell.

asked by Sandy on November 3, 2012
57. ## Bio(its urgent!)

according to cell theory, the cell is the basic unit of structure and function in the body. in two or more sentences, explain how this fact relates to the need for digestion. please i help! i have searched the sites but cannot find a answer...... plz help!

asked by Anonymous on November 12, 2008
58. ## chemistry

What is the plane and lattice structure that is represented in this picture? SC (100) BCC (100) FCC (100) SC (110) BCC (110) FCC (110) SC (111) BCC (111) FCC (111)

asked by Maikol on April 26, 2013
59. ## Chemistry

Crystal of Sodium form Cubic unit cell with edge length 430pm.Find the no.of atoms present per unit cell and also the type of unit cell. P.S. No radius or density is given so its a lil bit tough dan the rest... Plz Help ASAP !!

asked by Minhye on January 27, 2016
60. ## basic chem

The radius of a single atom of a genenric element x is 197 pm and a crystal of x has a unit cell that is face centered cubic. calc the volume of the unite cell. superr confused can you please show all work along with the answer Thank you

asked by Lauren on February 14, 2018
61. ## Chemistry

In our text book, the formula for finding the formal charge of an element in a compound is c(sub f) = X - (Y + Z/2) where x = the number of valence electrons y= the number of unshared electrons owned by the atom z= the number of bonding electrons shared by

asked by Alexa on December 6, 2006
62. ## Chemistry

The element Sc has hcp packing with a hexagonal unit cell. The density of Sc is 3000 kg/m3. Calculate the volume (L) of the unit cell of Sc. Sc Molar Mass =44.956 It is hcp, so it has 2 atoms/unit cell. I would appreciate any help with this problem! Thank

asked by Jenny Selby on February 8, 2017
63. ## Chem

At room temperature and pressure RbI crystallizes with the NaCl-type structure. (a) Use ionic radii to predict the length of the cubic unit cell edge. (b) Use this value to estimate the density. (c) At high pressure the structure transforms to one with a

asked by Matthew on January 2, 2018
64. ## chemistry

for NaTl, is the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral? how many of each of the 2 cubes drawn for NaTl are required its unit cell? is it 8?

asked by eng on February 15, 2010
65. ## Chemistry (geometric)

Calculate the number of cations anions, and formula units per cell unit of the following : rock-salt structure, and flourite....I have no idea how to do the second one but for the first one I got 13, 14, and 13.5 respectively. Also, what are the

asked by Sarah on October 24, 2010
66. ## college - chemistry

Hi, I was wondering if anyone could provide me the necessary information to solve this problem. For the following elements: CdSe CsI Li2O KBr NaCl ZnS(I) I've been asked to find the -Unit Cell of Larger ion -Type of Hole where Smaller Ions are found -# of

asked by Anonymous on February 16, 2009
67. ## college - chemistry

Hi, I was wondering if anyone could provide me the necessary information to solve this problem. For the following elements: CdSe CsI Li2O KBr NaCl ZnS(I) I've been asked to find the -Unit Cell of Larger ion -Type of Hole where Smaller Ions are found -# of

asked by Anonymous on February 16, 2009
68. ## Unit Cells

Copper has a unit cell volume of (47.453 A^3) and a face centered unit cell. How would I go about finding the volume of atoms within the unit cell? Would you use Avogadro's # somehow?

asked by CHeM on May 9, 2010
69. ## CHEM help needed

how do i find the Volume of Atoms within Unit Cell in(Å^3)? I think it has something to do with avogadros number but i do not know exactly...so far i know that the volume of the unit cell is 47.045881 Å^3. PLEASE HELP

asked by jerry on February 14, 2009

ok i need help with this like ASAP. Please math the following terms to their corresponding cell structure Cytoplasm [ K ] Flagella [ H ] Smooth Endoplasmic Reticulum [ ] Cilia [ ] Mitochondria [ ] Golgie Apparatus [ ] Chromosones/Genes [ N ] Rough

asked by Andrew on April 18, 2018
71. ## Chemistry

The density of solid W is 19.3 g/cm3. How many atoms are present per cubic centimeter of W? As a solid, W adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of W? What is the volume of a unit cell of this metal?

asked by Anonymous on January 18, 2013
72. ## chemistry

Molybdenum (Mo) has a density of 10.22 g/cm3 and it crystalizes into a fcc unit cell, calculate the radius of a (Mo) atom?

asked by Lilly on June 7, 2011
73. ## chemistry help!

Hello, I am having problem with two lab questions and was wondering if someone can help! 1. Calculate the percentage of the empty space in a face-centered cubic lattice, and show that it does not depend on the edge length of the unit cell ot on the size of

asked by Dina on February 4, 2010
74. ## chemistry

Hello, I am having problem with two lab questions and was wondering if someone can help! 1. Calculate the percentage of the empty space in a face-centered cubic lattice, and show that it does not depend on the edge length of the unit cell ot on the size of

asked by Dina on February 3, 2010
75. ## Chemistry AP HELP!

Tausonite, a mineral composed of Sr, O, and Ti, has the cubic unit cell and the chemical formula is SrTiO3..... Ti is coordinated by 6 O atoms, because the Ti is located at the center of the unit cell. To see the full coordination environment of the other

asked by kali mata on November 18, 2011
76. ## science

Gallium crystallizes in a simple cubic lattice. Sketch the unit cell. Determine the number of atoms present in the unit cell. The density of gallium is 5.904g/cm^3. Determine a value for the atomic (metallic) radius of gallium.

asked by Mustapha on May 24, 2016
77. ## a n p

which structure regluates the transport of substances in and out of a cell? cell's cytoplasm cell membrane nuclear membrance cell wall I believe it is cell membrane

asked by linda on May 20, 2015
78. ## Difracction problem

Diffraction from an unknown cubic metal is observed to occur at the following values of θ when using CuKα radiation. Determine the crystal structure to find the lattice constant. 20.1⁰, 29.2⁰, 36.6⁰, 43.5⁰, 50.2⁰, 57.4⁰, 65.5⁰ a) What is

asked by Eys on June 2, 2013
79. ## Chemistry

Give the formal charge on the sulfur atom in a Lewis structure for the sulfate ion in which every atom satisfies the octet rule. Based off my lewis structure, I think the formal charge of the the sulfur atom would be +2. Is that correct?

asked by Anonymous on May 2, 2017
80. ## chemistry help

Determine the number of moles of each specified atom or ion in the given samples of the following compunds.( Hint: the formula tells you how many atoms or ions are in each molecule of formula unit.) a. O atom in 3.161x10^21 molecules of CO2 b. C atom in

asked by jaz on March 8, 2009
81. ## general chemistry

Copper crystallizes in a face-centered cubic unit cell with an edge length of 362 pm. What is the radius of a Cu atom in pm?

asked by Anonymous on December 9, 2014
82. ## Chemistry

KF has the same type of crystal structure as NaCl. The unit cell of KF has an edge length of 5.39 Å. Find the density of KF in g/cm3

asked by Ian on December 8, 2012
83. ## Chemistry

KF has the same type of crystal structure as NaCl. The unit cell of KF has an edge length of 5.39 Å. Find the density of KF in g/cm3

asked by Ian on December 8, 2012
84. ## general chemistry

Copper crystallizes in a face-centered cubic unit cell with an edge length of 362 pm. What is the radius of a Cu atom in pm? What equation do you use?

asked by Anonymous on December 9, 2014
85. ## Solid State Physics

What does the phonon dispersion, that is, the vibrational frequency as a function of wave vector 𝜔(k), look like for an infinite chain of atoms with one atom per unit cell?

asked by curiousmind on November 9, 2018
86. ## Biology

Just need this checked: 'The cytoskeleton of eukaryotes serves many functions. One of these functions is served in prokaryotes by a different major structure. Which structural feature is it? How do these different structures serve the same function in the

asked by mysterychicken on February 5, 2010
87. ## Gen Chem

Barium has a radius of 224 pm and crystallizes in a body-centered cubic structure. What is the edge length of the unit cell?

asked by gagaga on April 19, 2010
88. ## chem

Determine the electron and molecular geometries of each of the following molecules. For those with more than one central atom, indicate the geometry about each central atom. (Enter your answers in the order given in the skeletal structure from left to

asked by hannah on January 29, 2011
89. ## Zoology

Can you rank these from the smallest to the largest? Heart carbon atom sodium atom electron nucleotide tundra mitochondria glucose molecule fungal cell hydrogen atom

asked by Marcus on August 29, 2010
90. ## Chemistry

what is the volume of the unit cell? A metal crystallizes in a face-centered cubic lattice. The radius of the atom is 0.197 nm. The density of the element is 1.54 g/cm^3

asked by Lauren on February 6, 2008
91. ## college. physics and chemistry and mathematics

An element crystalline in face centred cubic lattice. CCalculate the length of the side of the unit cell if the radius of atom is200pm

asked by nerswn narzary on August 5, 2015
92. ## chemistry

C4 H10 O or diethyl ether or with a formula of CH3CH2OCH2CH3 its stick structure is H H H H ! ! ! ! .. H-C-C-C-C- O-H ! ! ! ! .. H H H H I used the this ! sign as a sign for bond. pls help me to determine the geometry for each central atom in this

asked by chemdummy on October 5, 2012
93. ## drawing

Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each atom has a radius of 1.43 , what is the length of a side of the unit cell?

asked by Anonymous on July 21, 2010
94. ## Ap Chemistry

In a class discussion, my teacher told me that 74.06% of the volume of each unit cell is occupied by atoms (in the cubic closest structure). Where does this percentage come from? How can I find it?

asked by Matt on January 7, 2008
95. ## science

An electron micrograph of a newly discovered cell shows long projections with a basal body in the cell wall. What kind of projections are these? Is the cell prokaryotic or eukaryotic? How might this cell behave in its environment because of the presence of

asked by ’MICROBIOLOGY on March 10, 2012
96. ## chemistry

1state relative mass and charge of an electron 2 an atom of an element X may be written as 4X^9 (a)What does the figure 9 indicate? (b)what is the number of protons in an atom X? (c)what is the number of electrons in an atoms X? (d)what does the number 4

asked by pooja on May 4, 2012
97. ## chemistry

for NaTl, is the unit cell of it based on the repetition of body centered cubic and the holes in this unit cell are octahedral?

asked by eng on February 16, 2010
98. ## SCIENCE!!!

Explain how each of the following cell's structure is related to it's function Red blood cell- Nerve cel- Musle cell-

asked by Ella on November 22, 2008
99. ## Chemistry

The element palladium has ccp packing with a face-centered cubic unit cell. The density of Pd is 12 g/cm3. Calculate the volume (L) of the unit cell of Pd.

asked by Luc on February 9, 2010
100. ## chemistry

The unit cell of palladiu m is a cube that is 389. 03 pm on a side. There are 4 Pd ato ms in the unit cell. Calculate the density of palladium in grams per cubic centimeter.

asked by James on May 17, 2011