Chemistry – U2 Review
Name_______________________________
1. The neutral atoms in a given sample of an element could have different
(1) Mass numbers
(2) numbers of protons
(3) atomic numbers
(4) numbers of electrons
2. What is the maximum number of electrons that can occupy the second shell of an atom?
(1) 8
(2) 6
(3) 18
(4) 32
3. A neutral atom of an element has an electron configuration of 2-8-2. What is the total number of p electrons
in this atom?
(1) 6
(2) 2
(3) 10
(4) 12
4. What is the maximum number of electrons that can occupy the 4d sublevel?
(1) 6
(2) 2
(3) 10
(4) 14
5. The total number of orbitals in the 4f sublevel is
(1) 1
(2) 7
(3) 3
(4) 5
6. What is the total number of valence electrons in an atom of chlorine in the ground state?
(1) 2
(2) 5
(3) 17
(4) 7
7. What is the total number of shells that are completely filled in an atom of magnesium in the ground state?
(1) 1
(2) 2
(3) 3
(4) 4
8. Which sublevel represents the lowest energy level?
(1) 4s
(2) 4p
(3) 4d
9. The nucleus of a fluorine atom has a charge of
(1) +1
(2) +9
(3) +19
(4) 4f
(4) 0
10. Which orbital may contain the valence electrons of a calcium atom?
(1) 1s
(2) 2s
(3) 3s
(4) 4s
11. Which particle is electrically neutral?
(1) electron
(2) neutron
(3) proton
(4) positron
12. An atom of which element in the ground state contains valence electrons with a principal quantum number
of 4?
(1) Kr
(2) Ne
(3) Ar
(4) Xe
13. What is the total number of valence electrons in an atom of phosphorous in the ground state?
(1) 5
(2) 2
(3) 3
(4) 7
14. How many orbitals in a sulfur atom in the ground state contain one electron?
(1) 1
(2) 2
(3) 3
(4) 4
15. The number of protons in an atom of C-14 is
(1) 12
(2) 14
(3) 17
(4) 6
16. What energy level transition represents the greatest absorption of energy?
(1) 1s to 3p
(2) 2p to 3s
(3) 3s to 3p
(4) 3s to 4s
17. The maximum number of electrons that can occupy the fourth shell of an atom is
(1) 2
(2) 8
(3) 18
(4) 32
18. What is the total number of neutrons in an atom of potassium, whose mass number is 39 and atomic number
is 19?
(1) 19
(2) 20
(3) 39
(4) 58
19. Heat is added to a substance at a constant rate and the temperature of the substance remains constant. The
substance is
(1) solid melting at its melting point
(3) solid below its freezing point
(2) liquid above its freezing point
(4) liquid freezing at its freezing point
20. Which phase change represents fusion?
(1) gas to liquid (2) solid to liquid
(3) gas to solid
(4) liquid to gas
21. The mass number of an atom is equal to the total number of its
(1) protons and neutrons
(2) protons only
(3) electrons and protons
(4) electrons only
22. How many occupied principal energy levels are in an atom of carbon in the ground state?
(1) 3
(2) 6
(3) 2
(4) 1
23. What is the normal boiling point of water?
(1) 0 K
(2) 100 K
(3) 373 K
24. All atoms of a given element must have the same
(1) atomic mass
(2) atomic weight
(4) 212 K
(3) mass number
(4) atomic number
25. What is the total number of electrons in a neutral atom of fluorine whose atomic number is 9 and whose
mass number is 19?
(1) 10
(2) 9
(3) 19
(4) 28
26. The difference between the boiling point and freezing point of pure water is
(1) 32 K
(2) 100 K
(3) 272 K
27. Which substance readily sublimes at room temperature?
(1) liquid water
(2) solid carbon dioxide
(3) solid iron
(4) 373 K
(4) oxygen gas
28. Give the shell configuration for an atom of sulfur in the ground state.
29. Give an example of an atom of sulfur with an excited electron configuration.
30. Draw a model describing the structure of a nitrogen atom. Include the three subatomic particles in your
model.
31. Explain how Rutherford’s Gold Foil Experiment disproved John Dalton’s atomic model (that atoms are
densely packed spheres).
32. How many joules of energy are needed to heat a 10-g sample of H2O(s) from 0oC to H2O(l) at 100oC?