CH301
NAME: ______________________________________________
Unit 1 Practice Exam 2 KEY
1. Quantum Mechanics Application – H Atom
The size of an atomic orbital is determined by which quantum number?
a) ml
b) l
c) ms
d) n correct
2. Quantum numbers boundary conditions
In an atom, what would be the maximum number of electrons having the quantum numbers n =
6 and l = 2?
a) 72
b) 6
c) 10 correct
d) 8
3. Quantum numbers boundary conditions
Which set of quantum numbers does NOT provide a satisfactory solution to the wave equation?
a) n = 2, l = 0, ml = -1 correct
b) n = 1, l = 0, ml = 0
c) n = 4, l = 2, ml = +2
d) n = 5, l = 3, ml = -3
4. Periodic Table nomenclature
Fill in the blanks: potassium is one of the most well-known elements in the alkali metal ______. It
is in the ______ which makes it a ______ element. Its single valence electron is in the ______
subshell of the ______ shell, making it very reactive. It reacts readily with non-metals to form
______.
a) series; s block; common; l = 2; n = 4; networks
b) row; d block; main group; l = 1; n = 4; salts
c) family; s block; main group; l = 0; n = 4; salts correct
d) row; d block; non-metal; l = 1; n = 3; alloys
CH301 | 1
CH301
NAME: ______________________________________________
5. Aufbau, Hund & Pauli Theory
One of the following does NOT represent the ground state electron configuration for an atom.
Which one?
a) [Ne] 3s2 3p5
b) [Ne] 3s1 3p3 correct
c) [Ne] 3s1
d) [Ne] 3s2
6. Electron Configurations of atoms: no exceptions
Which of the following atoms has an s2p3 valence electron configuration?
a) Ga
b) Ge
c) As correct
d) Se
7. Electron configurations of ions: no exceptions
How many electrons are in the 4s orbital of a Ca2+ ion?
a) 0 correct
b) 2
c) -2
d) 3
8. Electron configurations of atoms: d block exceptions
A comparison of the electron configurations of nickel (Ni) and copper (Cu) indicates that
a) Cu has two more d electrons and one less s electron than Ni correct
b) Cu has one more d electrons and one more s electron than Ni
c) Cu has one more d electron and the same number of s electrons as Ni
d) Cu has two more d electrons and the same number of s electrons as Ni
9. Electron Configurations of atoms: d block exceptions
Which of the following would be the correct electron configuration for divalent ruthenium,
Ru(II)?
a) [Kr] 4s2 4d4
b) [Kr] 5s1 4d5 correct
c) [Kr] 5s2 4d4
d) [Kr] 4s1 4d5
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CH301
NAME: ______________________________________________
10. Electron Configurations and magnetism
Based on electronic configurations, which of the following species would you predict to be most
magnetic?
a) Sc
b) Ti
c) V
d) Cr correct
11. Periodicity theory: effective nuclear charge & shielding
What is the effective nuclear charge of a valence electron in the Al + cation?
a) 2
b) 3 correct
c) 12
d) 13
12. Periodicity theory: effective nuclear charge & shielding
As you move down a family on the periodic table, the increase in atomic radius can be explained
by the ______.
a) increase in number of shielding electrons correct
b) increase in effective nuclear charge
c) decrease in number of shielding electrons
d) decrease in effective nuclear charge
13. Ranking periodic trends without exceptions, atomic radius
Rank the following atoms in terms of decreasing atomic radius.
a) Na, N, O, Mg, F
b) F, O, N, Na, Mg
c) Na, Mg, N, O, F correct
d) F, Mg, Na, O, N
14. Ranking periodic trends without exceptions, ionic radius
Rank the following atoms and ions in order of decreasing size: Li +, Be2+, He, H-, B3+
a) H-, Li+, He, Be2+, B3+
b) B3+, Be2+, He, Li+, Hc) B3+, Be2+, Li+, He, Hd) H-, He, Li+, Be2+, B3+ correct
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CH301
NAME: ______________________________________________
15. Periodicity theory: islands of stability
Which of the following valence electron configurations does not exhibit enhanced stability?
a) s2
b) d5
c) d10
d) p5 correct
16. Periodicity theory: islands of stability
Which of the following trends is not solely explained by effective nuclear charge and shielding?
a) metallic character
b) ionization energy correct
c) atomic radius
d) ionic radius
17. Ranking periodic trends, exceptions, 1st ionization energy
The ionization energy of an Oxygen atom (O) is (equal to/greater than/less than) what you
would predict based on simple effective nuclear charge arguments because the half-filled 2p
orbital for O+ is (more/less) stable.
a) equal to; less
b) less than; more correct
c) greater than; less
d) less than; less
18. Ranking periodic trends, exceptions, 1st ionization energy
Rank the following from least to greatest ionization energy: silicon (Si), phosphorous (P), sulfur
(S).
a) P < S < Si
b) Si < P < S
c) S < Si < P
d) Si < S < P correct
19. Ranking electronegativity
What is the difference in electronegativity between C and O atoms?
a) 0.5
b) 1.0 correct
c) 1.5
d) 0.4
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CH301
NAME: ______________________________________________
20. Ranking electronegativity
What is the correct order of increasing electronegativity for N, O, P, and K?
a) P, K, N, O
b) K, O, N, P
c) K, P, N, O correct
d) O, N, P, K
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