Why can two different elements have similar atomic masses?

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  1. Science

    The Periodic Table 1) What conclusions can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? :Properties of elements are related to atomic numbers.*** :Properties of

  2. science

    1) What conclusions can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their properties? :Properties of elements are related to atomic numbers.*** :Properties of elements are related

  3. Chem

    Order the elements S, Cl, and F in terms of increasing atomic radii. I thought the answer was F, S, Cl, but the answer key said it was S, F, CL Why? AR decreases from left to right. Sulfur has one more energy level, so shouldn't its atomic radii be greater

  4. Chemistry

    1)The chemical formula for aspirin is C9H8O4. What is the mass of 0.40 mol of aspirin? How would I find this? 2)The gram molecular mass of oxygen is 16.0 g right? 3)How would I find the mass, in grams, of 3.01 x 10^23 molecules of water? 1. Add the atomic

  5. chemistry

    The element rhenium (Re) has two naturally occurring isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu. Calculate the mass of 185Re. am i supposed to multiply the

  6. science,

    1. How many periods are there in the periodic table? * 1 point 6 7 8 9 2. How many groups are there in the periodic table? * 1 point 15 16 17 18 3. State the number of valence electrons in an atom of Sulfur. * 1 point 2 4 6 8 4. State the number of valence

  7. Chemistry

    Classify the substances as atomic elements, molecular elements, molecular compounds, or ionic compounds. CO2, HCl, Al2S3, Cd, F2,Ag,O2,NaCl

  8. chemistry

    Examine the elements listed below. nitrogen (N), phosphorus (P), arsenic (As) Which of the answer choices accurately describes a common property of these elements? they have the same amount of atomic mass they have the same amount of reactivity they have

  9. Science

    What conclusion can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their priorities? A. Properties of elements are related to atomic numbers. B. Properties of elements are related to

  10. Chemistry

    Why are the atomic masses of elements usually decimal numbers?

  11. science

    neon and argon are both elements in a group of similar elements, noble gases what properties do these elements have that make them unique

  12. chemistry

    arrange the following elements in order of increasing atomic mass; Cu, C, K, H, F, Cl, Xe, Cr, Pb, Na

  13. chem

    Calculate the atomic mass of titanium. The five titanium isotopes have atomic masses and relative abundances of 45.953 amu (8.00%), 46.952 amu (7.30%), 47.948 amu (73.80%), 48.948 amu (5.50%), and 49.945 amu (5.40%)

  14. Math please check and thank you very much

    Elements are arranged in the periodic table based on various patterns. For example, elements found in the rows near the top A. have higher atomic numbers than the elements in the rows near the bottom. B. all have the same atomic number. C. have lower

  15. chemistry

    The element copper has naturally occuring isotopes with mass numbers of 63 and 65. The relative abundance atomic masses are 69.2% for mass=62.93 amu, and 30.8% for mass=64.93 amu. Calculate the average atomic mass of copper.

  16. chemistry

    After he finished his work, Mendeleev predicted _____. the atomic numbers of all the known elements the discovery of the radioactive elements the properties of three undiscovered elements the properties of sodium, lithium, and potassium

  17. chem help

    Arrange the following elements in order of increasing atomic radii. Sr, Rb, Sb, I, In

  18. Chemistry

    Which trends are observed when the elements in Period 3 on the Periodic Table are considered in order of increasing atomic number? (1) The atomic radius decreases, and the first ionization energy generally increases. (2) The atomic radius decreases, and

  19. 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

  20. 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

  21. Chem

    Elements with similar properties Answer occupy the same period of the periodic table have similar electron configurations have the same number of neutrons in their nuclei exist in the same physical state (solid, liquid, or gas)

  22. chm

    Why are the atomic masses listed in the periodic table not whole numbers? Answer Scientists have yet to make the precise measurements. That would be too much of a coincidence. ??>>The atomic masses are average atomic masses. or >>Today's instruments are

  23. 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

  24. 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.

  25. Science

    4. 3 elements are listed by atomic number, #19, 20, and 21. Which property do all of these elements have in common? They are all brittle. They all have 4 valence electrons. They are all malleable. ***** They shatter easily.

  26. Chemistry

    Suppose that atomic masses were based on the assignment of a mass of 12.000 g to 1 mol of carbon, rather than 1 mol of ^12C. What would the atomic mass of oxygen be? (The atomic masses of carbon and oxygen based on the assignment of 12.000 g to 1 mol of

  27. chem

    Bromine consists of two major isotopes with the following percent abundances and atomic masses: 79Br (50.54% and 78.918 amu) and 81Br (49.46% and 80.916 amu). Calculate the average atomic mass of bromine.

  28. science

    Name 2 elements that would have properties similar to Beryllium with atomic weight higher than 130.

  29. 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?

  30. CHEM Periodic Trends

    Each of the statements below attempts to explain why some periodic property varies predictably among elements in the periodic table. Determine if each statement is true or false. Within a family, elements with higher atomic numbers have higher

  31. physical science

    Periodic law states that when the elements are arranged according to their atomic numbers, this allows elements with similar properties to appear at regular intervals. Predict the group of elements and their number of valence electrons that will combine in

  32. chemistry

    1. A 12.5843g sample of zrbr4 was dissolved and after several steps all of the combined bromine was precipitated as ArBr. The silver content of AgBr was found to be 13.12160g Assume the atomic masses of silver and bromine to be 107.868 and 79.904.what

  33. Chemistry

    Of the 3 elements fluorine, nitrogen, and carbon, what is the atomic number of the one that has the largest atomic radius?

  34. chemistry

    kbear1 Read the following statement. Early on, atomic theory claimed that atoms were indivisible. Which answer choice describes how scientists refuted the claim of atomic theory stated above? (Select all that apply.) Scientists bombarded atoms of large

  35. science

    3. A section of the Periodic Table of the Elements is shown. Based on the positions of the elements, the two elements that have the most similar chemical properties are — A. calcium and scandium B. calcium and titanium C. titanium and vanadium D.

  36. Chemistry

    Without referring to a periodic table, pick the electron configuration of elements with the following atomic numbers and classify the elements. (Type your answer in noble gas notation using the format [Ar] 4s2 3d10 4p2 for [Ar]4s23d104p2.) (a) 17 (b) 20

  37. Chemistry

    Lithium has 2 isotopes. The relative atomic masses are 6.02 and 7.02. The average relative atomic mass of lithium is 6.94. What is the calculated relative abundance of the lighter isotope?

  38. science

    how do the masses of elements relate?(similar/difference) Please clarify the question. Generally, the mass increases as we go lower elements to higher elements in periodic table. There are a few exceptions.

  39. chemistry

    Put the following elements in order of increasing atomic size: Ca, O, B, Be B < O < Be < Ca Ca < Be < B < O O < B < Be < Ca Be < B < O < Ca

  40. chemistry

    Why can two different elements have similar atomic masses?

  41. chemistry

    The atomic masses of elements are generally not whole numbers. Explain why.

  42. chemistry

    which of the following is true regarding the transition elements? A. Multiple oxidation states resulting from the involvement of d electrons in bonding is a characteristic of transition elements. B. Most transition elements have lower melting and boiling

  43. Chemistry

    Element X consists of two major isotopes with the following percent abundances and atomic masses: 35.0% and 85.0 amu; and 65.0% and 84.0 amu. Calculate the average atomic mass of element X.

  44. 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

  45. 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

  46. Chemistry(please check my answer)

    The transuranium elements A. are the elements with atomic numbers above 92. *** B. occur in nature. C. are sometimes radioactive. D. all of the above

  47. chemistry

    what is an atomic mass unit? what are the approximate masses of the subtomic particles, expressed in atomic mass units?

  48. Chemistry

    I have a series of questions: What describes the arrangement of elements which repeat similar properties? Isn't the answer periodic table. next question who is the father of modern day periodic based on x-ray diffraction? Isn't the answer Dmitri Mendleev

  49. radioactive decay

    What elements results if one of the neutrons is in a nitrogen neucleus is converted by radioactive decay into a proton? The atomic number goes from 7 to 8, while the atomic weight stays the same. An electron (beta-) is emitted from the nucleus. Actually,

  50. biology

    I have some questions that relate to table 2.1 which lists the chemical elements that occur naturally in the human body. Similar percentages of these elements are found in most living organisms. a. In what abiotic (non-life) chemical forms are these

  51. 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

  52. chemistry

    what is the difference between elements in a group and elements in a period on the periodic table Elements in the same group have similar chemical properties. Element in the same period have properties that change periodically across the table. Check out

  53. 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

  54. Chemistry

    What data led to the development of the Law of Multiple Proportions? Give an example and explain why this law is important in chemistry. Would this be a good answer: John Dalton used the same observations he used for his law of definite proportions to help

  55. Integrated Science

    How did Mendeleev organize the elements in the periodic table? A) By decreasing atomic mass from left to right and top to bottom B) By decreasing atomic # from left to right and top to bottom C) By increasing atomic # from left to right and top to bottom

  56. chemistry

    What would be the MOLARITY (M) of the NaBr in the same buffer solution, if its concentration is now 0.9% (w/v)? Relative atomic masses:Na = 23; Br = 80

  57. chemistry

    Rank these elements in terms of increasing atomic radius AI, F, Sr, N, Cs

  58. chemistry

    Calculate the percentage composition of sulphuric acid if the atomic masses are H=1u, S=32u and 0=16u

  59. Chemistry

    When you look up the atomic masses of Si and Sn and then find the average and then look up the atomic mass of Ge, what is discovered? does it lend supporting evidence to the periodicity of elements?

  60. Chemistry

    Why are the atomic masses of elements usually decimal numbers?

  61. Chemistry

    Why are the atomic masses of elements usually decimal numbers?

  62. 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

  63. science chem

    give one example of two elements that would be placed incorrecty if they were in order of their relative atomic masses. and explain why placing these two elements like this would not be correct. Pleasw could someone help me. Co/Ni is one. Ar/K is a second

  64. 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

  65. 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

  66. Chemistry

    How does atomic mass relate to the mole? Atomic mass can be used to calculate Avogadro’s number of a sample of a compound or element. Avogadro’s number explains the number of grams in a single mole of the sample. Thus, Avogadro’s number that is

  67. Chemistry (check)

    is the following sentence true or false? To determine the number of representative particles in a compound, you count the molecules by viewing them under a microscope.__true______ Most molecules are too small to see with an ordinary microscope. Can molar

  68. chemistry

    What instrument is used to determine the mass and relative ambuandaces of small atomic particles? You may be thinking of the mass spectrometer. I'm not sure how small you are talking about but the mass spec is used to determine atomic masses and relative

  69. chemistry help!!! (clueless)

    how do i find the mass number of chemicals I would think that you would add up the components masses (molecular masses [from periodic table) that make up the chemical... like...HCl (H= 1.008g/mol, Cl= 35.45g/mol) added= 36.458g/mol hope this helps=)

  70. science

    why does the change for the atomic radii of the elements in period 3 look similar to period 2?

  71. Chemistry

    We did a flame test today to see what substances produce what colors when burned. Can you please explain... Why each of the different elements have a different atomic emission spectrum? Would the flame tests be useful for detecting individual elements

  72. 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

  73. Chemistry

    Of the 3 elements nitrogen , oxygen , and aluminum, what is the atomic number of the one that has the smallest atomic radius?

  74. Chemistry

    Which of the following best explains how relative atomic mass could be determined from the type of data available to Dalton? A. By determining the mass of oxygen contained in a sample of water, its exact atomic mass could be determined. B. By comparing the

  75. chemistry

    The elements A and Z combine to produce two different compounds: A2Z3 and AZ2. If .15 mol of A2Z3 has a mass of 15.9g and .15 mole of AZ2 has a mass of 9.3g, what are the atomic masses of A and Z? Could somebody please help me with this? Can I make a

  76. science

    Mercury is a heavy metal. Using atomic models and the periodic table of elements, explain why it belongs to this category of elements

  77. Chemistry

    Do elements with higher masses always have lower average velocity than those elements with a low mass? Thanks

  78. Gps

    Arrange in order of increasing atomic size use appropriate < > -= symbol to separate substances in the list 1. The period 2 elements Be,B and N The group 4A elements Sn,Si, and Pb

  79. Science

    1. How does nanotechnology how engineers make products for the future? A. By changing a materials atomic structure, it can be made from elements that are easier to obtain. B. By changing a materials atomic structure, it's physical properties can also be

  80. Physics

    Is the mass of an atomic nucleus greater or less than the sum of the masses of the nucleons composing it? Why don't the nucleon masses add up to the total nuclear mass?

  81. Chemistry 106

    What are the elements used to make the ingrediants of each category (the same element may be listed in several categories, but a maximum of once in each of the 6 categories, no matter how many different ingrediants it may be in)? **name of the element with

  82. science

    what is an atomic mass unit? What are the approximate masses of the subatomic particles, expressed in atomic mass units? http://www.dummies.com/WileyCDA/DummiesArticle/id-1668.html

  83. Chemistry- Diffusion

    Will gases that have similar molar masses have similar rates of diffusion?

  84. Chem

    What pairs of ions produce similar colours in the flame test? Use your periodic table of elements to explain the reason for this. I think it's the different groups of elements, but I'm not sure.

  85. 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

  86. 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?

  87. Science

    When elements in the same group form molecules, the number of outer-shell electrons involved is the same and so the number of bonds forming the molecule is the same roo. Eg. Every element in group 2 (groupII) is a solid metal. When these elements bond with

  88. chemistry

    what is reason for the different atomic masses of the isotopes of an element

  89. Please someone explain to me

    My homework says describe how the exterior of a structure differ of share similar design art elements from the interior. Does that mean elements of art, or features of architecture like arches, windows, etc?

  90. music

    Compare and contrast European Western music to music of other cultures?.What elements are similar?.What elements are different?.

  91. 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

  92. chemistry

    what are the appropriate masses of the subatomic particles expressed in atomic mass unit

  93. Fine Art

    How are the elements of art depicted in the artwork named "Winged genie fertilizing a date tree?" I know that shape, line and space is used but I do not know how they are used in this artwork. I even looked at all the other similar questions but none of

  94. Science

    Atoms of the same elements that have different atomic mass are called?

  95. fine art

    Discuss how the exterior of the Hagia Sophia differs or shares similar design art elements from the interior. I'm confused on how to compare the interior and exterior. And are "design art elements" the same as the elements of art or is it something else?

  96. Science

    Consider an atom whose designation is given as 94 Pu 242. How many Protons are found in this atom? http://www.chemicalelements.com/elements/pu.html Protons same in all isotopes. The number of nutrons varies to change to atomic weight there are 94 because

  97. Physics check

    The spectral lines for elements are sometimes called atomic..... spectra?

  98. Chemistry

    Rank the elements B, Al, Na, Mg from largest to smallest atomic radius. Would it be: Al, Mg, Na, B?

  99. Physics

    How can elements with low atomic numbers have so many spectral lines?

  100. science

    List 3 other elements similar to properties of Flourine. a. Why did you choose these? b. How did you determine their properties were similar?

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