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Questions for Regents Practice: Atomic Structure
Parts A and B-1 Multiple Choice
10. How do the energy and the most probable location of an electron in the third
shell of an atom compare to the energy and the most probable location of an
electron in the first shell of the same atom?
1) In the third shell, an electron has more energy and is closer to the nucleus.
2) In the third shell, an electron has more energy and is farther from the nucleus.
3) In the third shell, an electron has less energy and is closer to the nucleus.
4) In the third shell, an electron has less energy and is farther from the nucleus.
11. During a flame test, ions of a specific metal are heated in the flame of a gas
burner. A characteristic color of light is emitted by these ions in the flame
when the electrons
1) gain energy as they return to lower energy levels
2) gain energy as they move to higher energy levels
3) emit energy as they return to lower energy levels
4) emit energy as they move to higher energy levels
12. A particle of an atom contains 26 protons, 23 electrons, and 56 neutrons.
What will be the correct atomic number for this particle?
1) 26 2) 23 3) 56 4) 33
13. An atom with 21 neutrons and 40 nucleons has
1) A nuclear charge of +19 3) A mass number of 61
2) A nuclear charge of +40 4) A mass number of 19
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14. Which element could have a mass number of 86 atomic mass units and 49
neutrons in its nucleus?
1) In 2) Rb 3) Rn 4) Au
15. Which correctly represents two isotopes of element X?
1) 226 X and X 3) 227 X and 227 X
226
91 91 91 90
2) 226 X and 227 X 4) 226 X and 227 X
91 91 90 91
16. Which atom is an isotope of oxygen?
14
1) N 2) N 3) O 4) O
14
17
16
7 8 7 8
65
17. What is the total number of nucleons in the nuclide Zn?
30
1) 65 2) 30 3) 35 4) 95
18. In which pair of atoms do the nuclei contain the same number of neutrons?
1) Calcium-40 and Calcium-42 3) Bromine-83 and Krypton-83
2) Chlorine-35 and Sulfur-34 4) Iodine-127 and Bromine-80
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