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Atomic Theory and Structure
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Atomic Theory and Structure
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21 Questions

1. Based on the ionization energies for element X listed in the table above, which of the following elements is X most likely to be?
2. The atomic mass of Sr is 87.62. Given that there are only three naturally occurring isotopes of strontium, 86Sr, 87Sr, and 88Sr, which of the following must be true?
3. All of the following are true statements about the periodic table except:
4. Which of the following properties generally decreases from left to right across a period (from potassium to bromine)?
5. Which of the following best explains why the F−ion is smaller than the O2– ion?
6. The atomic mass of bromine is 79.904. Given that the only two naturally occurring isotopes are 79Br and 81Br, the abundance of 79Br isotope is approximately:
7. All of the following statements describe the elements of the group 1 alkali metals (not including hydrogen) except:
8. Which of the following elements would be expected to have chemical properties most similar to those of phosphorus?
9. The most difficult to oxidize in a given period
10. Two unknown, solid substances are analyzed in a lab. The results are shown above. True statements about the composition of these two substances include: I. Substance 1 contains an alkali metal. II. Substance 2 contains an alkali earth metal. III. Substance 2 contains a transition metal.
11. Which of the following lists contains all the diatomic, elemental gases at standard temperatures and pressures?
12. The atomic mass of Sr is 87.62. Given that there are only three naturally occurring isotopes of strontium, 86Sr, 87Sr, and 88Sr, which of the following must be true?
13. As atomic number increases from 11 to 17 in the periodic table, what happens to atomic radius?
14. The effective nuclear charge experienced by a valence Kr is different than the effective nuclear charge experienced by a valence electron of K. Which of the following accurately illustrates this difference?
15. Which of the following pairs are isoelectronic (have the same number of electrons)?
16. Their monovalent cations form clear solutions
17. Which of the following is the most accurate interpretation of Rutherford’s experiment in which he bombarded gold foil with alpha particles?
18. Which of the following lists contains all the diatomic, elemental gases at standard temperatures and pressures?
19. Which of the following pairs are isoelectronic (have the same number of electrons)?
20. All of the following statements describe the elements of the group 1 alkali metals (not including hydrogen) except:
21. All of the halogens in their element form at 25°C and 1 atm are:

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