Distinguish between atomic number and atomic mass number.

75,429 results
  1. use the mole quick check

    1. The atomic mass is equivalent to 1/12 of the mass of a neutral atom of which element? a. gold b. hydrogen c. carbon d. oxygen 2. for an element, how does Avogadro’s number connect the atomic in the macroscopic scales? a. it describes the number of

  2. physical science

    Which statement about the number of protons and neutrons in a nuclear change is correct?(1 point) The total number of neutrons and the total number of protons are the same before and after the change. The total number of neutrons and the total number of

  3. chemistry

    How does Avogadro’s number relate to the atomic mass and moles of an element? 1. Avogadro’s number can be used to convert the atomic mass of an element to the mass of one mole of that element. 2. The atomic mass of an element can be used to convert

  4. College Chemistry (Hard)

    The easiest fusion reaction to initiate is 1-1H + 1-1H------> 4-2He + 1-0 n The 1-1 indicates a small one above the other on the left side of the symbol of the element.So for 1-0n is a one above a zero on the left side of n (neutron). The number on the top

  5. science

    How does the nucleus change in beta-plus decay? The mass number increases by one, and the atomic number remains the same. The mass number remains the same, and the atomic number increases by one. The mass number remains the same, and the atomic number

  6. CHEMISTRY HELP !!!!

    If a nucleus undergoes beta particle emission a. its atomic number decreases by four and its mass number decreases by two. b. its atomic number decreases by two and its mass number decreases by four. c. its atomic number increases by one and its mass

  7. Chemistry-Bonding

    Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92). a.) O with F _________ b.) Ca with Cl __________ c.) Na with Na _________ d.) U with Cl

  8. Chemistry

    What is the nuclear charge of an atom with a mass of 23 and an atomic number of 11? (1) 11+ (2) 12+ (3) 23+ (4) 34+ How do you figure this out? Would the answer be (1) 11+ since the atomic number is 11 and atomic #=protons which are positive??

  9. chemistry

    name each isotope, and write it in symbolic notation atomic number 26; mass number 56 atomic number 29; mass number 64 atomic number 17; mass number 37

  10. science

    The atomic number of gold is 79 how many neutrons are there in an atom of gold that has atomic mass of 197 amu how you got your answer

  11. chemistry

    1.what is meant by atomic number of an element? 2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element? 3.an element has an atomic number of 11 and its mass

  12. Science

    if an atom has 17 electrons and its mass number is 35, calculate the following: number of protons, atomic number, and number of neutrons. i think there would be: an atomic number of 17, there would be 17 protons, and there would be 18 neutrons. am i

  13. Chemistry

    Write a brief passage describing a neutral atom of nitrogen-14 (N-14). Describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to

  14. science

    HELP ME !!!!!!! What is the atomic number of an atom?(1 point) the number of particles in the nucleus the number of protons the number of neutrons the number of particles outside the nucleus Which statement about an atom is correct?(1 point) The proton has

  15. Science

    Use the following words to fill in the blanks. Atomic number Ionic bond Atomic mass Law of conservation of mass Endothermic reaction Electron Covalent bond Product Isotope Proton Carbon cycle Energy level, orbital, or shell Atomic model Atomic theory 1.

  16. science

    Given the following nuclear reaction 251 0 A ----- Cf ----> --- Y + --- X 98 0 Z 1. What is the atomic mass of the new atom?: 2. What is the atomic number of the new atom?: 3. What is the atomic symbol of the new atom?: 4. What type of decay is

  17. Atoms ASAP

    An atom of potassium has an atomic mass of 39 amu and an atomic number of 19. It therefore has ______ neutrons in its nucleus. a. 19 b. 39 c. 20 d. 2

  18. Science

    What is the atomic number of an atom?(1 point) A. the number of particles outside the nucleus B. the number of particles in the nucleus C. the number of neutrons D. the number of protons Which statement about an atom is correct?(1 point) A. The neutron has

  19. Chem Check Please!!!

    1) Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10^-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2

  20. science

    If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus? A. A+ 1, Z + 1 B. A-1,Z-1 C. A+ 1, Z-1 D. A-1, Z + 1 My answer is B

  21. Chemistry

    41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons. This is what I got- Protons: 19 Neutrons: 20 Electrons: ? Thanks -MC

  22. Chemistry

    I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it. (a) atomic number=53, number of neutrons=79 I looked at the periodic table for 53 so the element is Iodine. So They gave the atomic number and I have the

  23. chem1 WORD PROBLEM!!

    lead has an atomic number of 82;iron has an atomic number of 26; and copper has an atomic number of 29.how do the charges of the nuclei of these 3 elements compare?

  24. Chemistry

    An isotope, X, of a particular element has an atomic number of 15 and a mass number of 31. Which of the following statements are true? I. X is an isotope of phosphorus. II. X has 16 neutrons per atom. III. X has an atomic mass of 30.973

  25. Science

    Suppose the atomic mass unit had been defined as 1/10 the average mass of an atom of phosphorus .what would the atomic mass of carbon be on this scale? What would Avogadro's number be ?

  26. science

    1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms

  27. Chemistry-10th grade

    Hi! Good morning! I was suppose to turn in this test yesterday. Can You please help me with these last two essay questions. The first one I got the answer, just please tell me if it is correct and the second I don't know the answer. Please help ASAP! Thank

  28. Final Exam- Honors Physical Science

    how can you determine the number of protons, electrons,neutrons, atomic number, and the atomic mass of an element using the periodic table? Atomic mass is given in the table, as well as the atomic number and atomic mass number. Atomic number is the number

  29. physics

    What happens to the atomic number of the daughter nucleus if it is formed after the emission of the beta particle? The atomic number remains the same. The atomic number increases by two. The atomic number increases by one. The atomic number decreases by

  30. Anonymous u r active..help me!

    Atomic symbol of aluminum is written as atomic number(13) atomic mass(27).what information do you get from it *tell me of its right*:(solution; atomic no=13 atomic mass=27 no. of electrons=13 no. of protons=13 no. of neutrons=A-Z no. of neutrons=27-13=14

  31. Chemistry

    Which if the following has the greatest number of particles 4g of lithium (atomic mass of li=7) 4g of chlorine gas (cl2) (atomic mass of cl=35.5) 4g of hydrogen gas (h2) (atomic mass of h=1) 4g of water (atomic mass of h=1, atomic mass of o= 16

  32. Science

    Hey....I need help with my homework. I'm in 9th grade, high school. Its pyhsical science about Atomic Math.. Heres the question: Multiply the atomic number of hydrogen by the number of electrons in mercury, which has an atomic number of 80.

  33. chemistry

    I wanted to check my True and False Chemistry HW. I am not 100% they are correct. 1.the number of neutrons in an atom is reffered to as its atomic number False 2.the periodic table is arranged by increasing atomic number True 3.atomic number is equal to

  34. physical science

    Thanks got through all but one Element P has an atomic number of 92 and atomic mass of 238. Element s has 92 protons and 143 neutrons. atomic number and protons are the same would htese two elements be an isotope or different elements

  35. chemistry

    Can someone help me with this? 1)What new element is formed if magnesium-24 is bombarded with a neutron and then ejects a proton? Write a balanced nuclear equestion for this transmutation. Is this beta decay? That's what I'm thinking, but I'm not sure. It

  36. Physics

    When nitrogen(atomic mass=14,atomic number=7) is bombarded with neutrons, the collision resulted in disintegrations in which alpha particles are produced. Represent this transmutation in symbolic equation .

  37. Science

    1. Which statement about subatomic particles is NOT true? (1 point) Protons and neutrons have almost the same mass. Protons and electrons have opposite charges. Unlike protons and electrons, neutrons have no charge. Protons and neutrons have the same

  38. science

    Cobalt (Co) has an atomic mass of 59 and an atomic number of 27. Which statement correctly describes an atom of cobalt?

  39. science 20-1

    An atom has an atomic mass of 32.06 and an atomic number of 16. a. Determine the identity of the atom. b. Determine the number of neutrons in the most common form of the atom. c. Determine the number of valence electrons this atom has.

  40. Physics

    1.How does the mass of a nucleon compare with the mass of an electron? 2.Distinguish between atomic number and atomic mass number. 3.Why do protons in a very large nucleus have a greater chance of flying apart by electrical repulsion? 4.What exactly is

  41. Chemistry

    The standard atom for the atomic masses of all the elements is the atom of carbon which has 6 protons and 6 neutrons (12C) and is assigned the atomic mass of exactly 12. Under this standard, the atomic mass of iron, atomic number 26, is 55.845 u and the

  42. Physics

    What happens to the atomic number of the daughter nucleus if it is formed after the emission of the beta particle? The atomic number remains the same. The atomic number increases by two. The atomic number increases by one. The atomic number decreases by

  43. Chemistry

    Atomic symbol of aluminum is written as atomic number(13) atomic mass(27).what information do you get from it *tell me of its right*:(solution; atomic no=13 atomic mass=27 no. of electrons=13 no. of protons=13 no. of neutrons=A-Z no. of neutrons=27-13=14

  44. Physics

    A neutron causes the element 88X232 to change according to the reaction 0n1 + 88X232 ---->ZYA + . Identify the (a) atomic number and (b) atomic mass number of the daughter nucleus. (c) This product subsequently undergoes - decay, and its daughter does too.

  45. math

    The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium.

  46. science Help 911!!

    One way the modern atomic model differs from Thompson's atomic model is that electrons are no longer scattered throughout an atoms positive matter like chocolate chips in cookie dough. Instead, each electron is outside of the nucleus occupying a

  47. Chemistry

    How is it possible that the atomic number increases in order, yet the atomic masses do not? A. There is no relationship between the atomic number and mass of the atom. B. The masses of the protons for Te, I, and Xe have slightly different masses. C. Since

  48. physics

    hello, does the density of an element have anything to do with the number of elections? i have to work with a partner and his reasoning is this: "the higher the atomic number, the greater the density because the atomic number is made up of protons so the

  49. Chemistry(please check my answer)

    Which of the following is true concerning gamma radiation? A. The mass number of the radioisotope decreases by four. B. The atomic number of the radioisotope decreases by two. C. The atomic number of the radioisotope increases by one. D. Neither the mass

  50. Phyiscal science test monday

    The following is a periodic table below All the letters are in squares The S = an empty square 13 Colums in total Questions: 1. Which pair of eleemtns has the same number of valence electrons? clueless 2. What pair of elements is in the same period? D and

  51. chem/phys

    Calculate the number of H2O molecules in a human body of mass 66.5 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.) 1

  52. Chemistry Help.......

    Which element results if 2protons and 2neutrons with the atomic number 88 and mass number 226? Show workings Help please Since this is not my area of expertise, I searched Google under the key words "atomic number 88" to get these possible sources:

  53. Chemsitry

    Alpha, beta particles and gamma rays. How does the atomic number and atomic mass number change when a radioisotope decays to produce alpha beta or gamma radiation.

  54. Chemistry Subatomic particles

    Fill in the chart (Numbers correspond to each other[I.E 1 in 1st group connects with 1in 2nd]) Subatomic particle found 1.Proton 2.Neutron 3.Electron Scientist 1.Rutherford 2.Chadwick 3.Thomson Experiment 1.Gold Foil Experiment? 2.? 3.Cathode Ray Tube Data

  55. Physics

    A neutron causes the element 88X232 to change according to the reaction 0n1 + 88X232 ---->ZYA + . Identify the (a) atomic number and (b) atomic mass number of the daughter nucleus. (c) This product subsequently undergoes - decay, and its daughter does too.

  56. math

    The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

  57. science

    1. When Mendeleyev arranged the elements into the periodic table, he found that elements with fell into groups on the table A. the same mass B. similar size C. Similar properties D. The same color 2. Every element has its own atomic number. The atomic

  58. physics

    hello, does the density of an element have anything to do with the number of elections? i have to work with a partner and his reasoning is this: "the higher the atomic number, the greater the density because the atomic number is made up of protons so the

  59. Dr. Bob, help please

    does the density of an element have anything to do with the number of elections? i have to work with a partner and his reasoning is this: "the higher the atomic number, the greater the density because the atomic number is made up of protons so the more

  60. science

    please help 1.What effect do isotopes of a given element have on the atomic mass calculated for that element? 2. Name two nucleons. 3. Distinguish between atomic number and mass number. 4. Distinguish between mass number and atomic mass. 5. How is the

  61. chemistry

    7. (a) The following elements represent atoms of elements showing their mass numbers and atomic numbers: 40 Ar and 39 K 18 19 i. Explain why argon has lower atomic number but greater atomic mass than that of potassium. ii. Explain why argon is neither

  62. Science college

    An elements X having mass and atomic number A and Z react with neutron to give gamma ray and P with mass and atomic number 1.what is X?

  63. science

    Is there any effect in the mass of an atom if it becomes negatively charged? I know that atomic mass and mass number are two different things but the change in electrons (although may not affect the mass number) may affect the atomic mass, wouldn't it?

  64. Chemistry

    What atomic mass is equivalent to seven helium nuclei? What atomic number is equivalent to seven helium nuclei? Now subtract that from the atomic mass and number of ununhexium suppose the isotope of ununhexium ( find the symbol for this as well) undergoes

  65. Chemistry

    12) Naturally occurring argon is composed of 0.3365% of 36Ar (atomic mass, 35.9675 u), 0.0632% of 38Ar (atomic mass, 37.9627 u), and 99.6003% of 40Ar (atomic mass, 39.9624 u). Use these data to calculate the average atomic mass of argon.

  66. Chemistry

    If an element N has isotopic abundances X% of mass number 12, atomic number 6, and Y% of N of mass number 13, atomic number 6. If their relative isotopic mass is 12.35. Find X and Y.

  67. Chemistry

    Suppose the atomic mass unit had been defined as 1/10 th of the average mass of an atom of phosphorus. What would the atomic mass of Carbon be on this scale. What would Avogadro's number be?

  68. chemistry

    Estimate the number of atoms in 7.827 g of iron using the mass of an atomic mass unit (1.661 x 10^-27). The atomic mass of Fe is 55.85 u.

  69. Science Help!!!

    Sodium chloride is formed when the mental sodium bonds to the nonmetal chlorine. The atoms are held together by a *Blank* Atomic Number Product Isotope Ionic Bond Proton Atomic Mass Atomic Theory I would say Ionic bond is that right?

  70. Chemistry 1

    I have trouble understanding ratios and relativity so I can't understand how to use atomic mass units. Here is an example from my book: How many grams of iron would contain the same number of iron atoms as the number of carbon atoms contained in 1.000 g of

  71. Physics

    What happens to the atomic number of the daughter nucleus if it is formed after the emission of the beta particle? The atomic number remains the same. The atomic number increases by two. The atomic number increases by one. The atomic number decreases by

  72. Kelsie

    name the element wsith the atomic number z= 15 and the atomic mass number 31. How many electrons does the neutral of this lement have? How many neutrons does the neutral atoms of this element have? I know the element with the atomic number of 15 and atomic

  73. chemistryI

    If 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 which element will be the result? Could someone please tell me how to work this out. Thanks. The atomic number is the count of protons...so if two are

  74. physics

    A neutron causes the element 88X232 to change according to the reaction 0n1 + 88X232 ---->ZYA + . Identify the (a) atomic number and (b) atomic mass number of the daughter nucleus. (c) This product subsequently undergoes - decay, and its daughter does too.

  75. math

    The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

  76. math

    The atomic number of cadium is half the atomic number of curium. Define a variable and write an expression for the atomic number of cadmium. I'm working in a group with my friends and we need help we're not the same people.

  77. Elements

    Which elements result if two protons and two neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226? What element is atomic number 86 and mass 222? Sorry, should be atomic number 88. Huh? It ejected two protons, changing the

  78. Chemistry

    Plutonium-239 is used in nuclear bombs. Determine the number of protons and neutrons in plutonium-239. I really don't understand this. Can someone tell me how to do this? thanks What is the atomic number of Pu? Look it up on the periodic table...that is

  79. Chemistry

    18. Explain how the atomic number of an element identifies the element. 19. How can atomic number and mass number be used to find the numbers of protons, electrons, and neutrons? 20. An atom is identified as platinum-195

  80. S103

    Which element results if 2 protons and 2 neutrons are ejected from a radium nucleus with atomic number 88 and mass number 226 - show workings? What is actually ejected is an alpha particle (helium nucleus). The new atomic number is 88-2 = 86 and the new

  81. chemistry

    Given the following Unknown atoms with their respective atomic numbers, X; Atomic number 19, Y; Atomic number 15, a. Deduce the identities of the elements X and Y. b. What are the mass numbers of the two elements X and Y? c. Calculate the number of

  82. chemistry

    Estimate the number of atoms in 2.429 g of iron using the mass of an atomic mass unit (1.661 x 10 ^ -27). The atomic mass of Fe is 55.85 u.

  83. science

    what is the proton if atomic number is 6 and atomic mass is 12

  84. biology

    If an atom of sulfur (atomic number 16) were allowed to react with atoms of hydrogen (atomic number 1), which of the molecules below would be formed? a.S-H b.H-S-H c.H-S-H | H d.H | H-S-H | H e.H=S=H

  85. Chem

    The atomic numbers and masses must added up on both sides of the equation just as we must have the same number of atoms on each side of an equation when it is balanced. Ejection of a "thing" with 2 protons and 2 nuetrons is a He nucleus which is an alpha

  86. chemistry

    If the arsenic is 76% and oxygen is 24% how would I calculate the chemical composition of of the oc=xide of arsenic that has been formed? Divide 76 by the atomic weight of As (which is 74.92) and 24 by the atomic weight of O (which is 16.00). The two new

  87. Science

    1. Consider a neutral atom that has 17 electrons A.) how many protons does it have b.) what is it's atomic number c.)which element is it 2. List the following for an atom with 33 protons and 42 neutrons a.) the name of the element b.) the atomic number

  88. US History

    41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons. This is what I got- Protons: 19 Neutrons: 20 Electrons: ? Thanks -MC

  89. spin of a electron

    I have to know the spin of a electron and what I have in my notes has me confused. 1. If the # of neutrons and # protons of a element are odd the element has a whole spin # (1, 2, 3) examples given: 2 H 11 B 14 N 17 O 33 S 35 Cl (I think those are mass

  90. physics

    Distinguish between atomic number and atomic mass number.

  91. Chemistry

    If an element N has isotopic abundances X% of mass number 12, atomic number 6, and Y% of N of mass number 13, atomic number 6. If their relative isotopic mass is 12.35. Find X and Y.

  92. science Help 911!!

    If new information about the behavior of atoms is discovered and verified, then revisions will need to be made to the current? A. atomic theory B. atomic model C. atomic number D. carbon cycle Is the answer A?

  93. Chemistry

    Congratulations! You have discovered a new element called Bhauzium (Bz). The average atomic mass of Bz was found to be 348.72 amu and its atomic number is 123. a) if the atomic masses of three isotopes of Bhsuzium are 342.92 amu, 356.43 amu (6.52%), and

  94. bio

    The number of electrons in an atom affects its: atomic number atomic mass charge nucleus Answer: charge

  95. science

    15. Why would you expect strontium to be chemically more similar to calcium? They are in the same family/group.*** They are in the same period. They have the same atomic number. They have the same atomic mass.

  96. Physics

    Calculate the number of H2O molecules in a human body of mass 65.9 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)

  97. physics

    Calculate the number of H2O molecules in a human body of mass 50.6 kg. Assume that, on average, water makes up 62% of the mass of a human body. (Use 1.0 u for the atomic mass of hydrogen, and 16.0 u for the atomic mass of oxygen.)

  98. biology

    If A represents atomic mass and Z represents atomic number, which of the following describes an atom after a proton is emitted from its nucleus? A. A+ 1, Z + 1 B. A-1,Z-1 C. A+ 1, Z-1 D. A-1, Z + 1 My answer is B.

  99. biology

    i'm doing a project on orbital rules and i don't remember how to get the atomic mass and the atomic number. i know wher P comes from but i don't know how to get N

  100. Physics

    An ideal gas at 18.0 °C and a pressure of 2.83 x 105 Pa occupies a volume of 2.63 m3. (a) How many moles of gas are present? (b) If the volume is raised to 5.09 m3 and the temperature raised to 31.6 °C, what will be the pressure of the gas? If N is the

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