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Atoms & Elements Problem Set


  1. How many protons, neutrons and electrons are present in one atom of the following:
    1. 1H
    2. 2H
    3. 3H
    4. 13N
    5. 14N
    6. 15N
    7. 79Br
    8. 81Br1-
    9. 262Bh
  2. What is the Atomic Weight of chlorine given that:

    Is this the answer that you expected?

  3. What is the Atomic Weight of ruthenium given the following information from WebElements:
    Isotope Abundance Exact Mass
    96Ru 5.54% 95.907599
    98Ru 1.87% 97.905287
    99Ru 12.76% 98.9059389
    100Ru 12.60% 99.9042192
    101Ru 17.06% 100.9055819
    102Ru 31.55% 101.9043485
    104Ru 18.62% 103.905424

    Is this the answer that you expected?

  4. Calculate the number of moles in:
    1. 20.1797 g of Ne
    2. 45.3594 g of Ne
    3. 0.198669 g of Ne
    4. 0.198669 g of Ta
  5. Calculate the mass of:
    1. 1.00 mol of Fe
    2. 2.00 mol of Fe
    3. 4.362 x 10-5 mol of Fe
    4. 4.362 x 10-5 mol of Li
  6. Using a blank periodic table, fill in the atomic number, name, atomic symbol, and atomic weight of the first 36 elements. Also label the noble gases, the halogens, the alkali metals, the metals, and the non-metals.
  7. Use the mass spectrum for chromium given below to determine the atomic weight.

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