Quiz 11 Practice Answers

CHEM 1100 Dr. Stone More Practice for summer 2015 quiz 11
1. Arrange the following atoms in order from smallest diameter to largest diameter:
a. C>Ga>F>Si>Nb>Co>Rb
b. C<F<Si<Ga<Co<Nb<Rb
c. F<C<Si<Co<Ga<Nb<Rb
d. C<F<Si<Co<Nb<Ga<Rb
e. C<F<Si<Co<Ga<Nb<Rb

2. True or False: The Auf bau principle describes filling orbitals from the highest energy to the lowest energy orbital.

3. What is Hund's rule? Fill orbitals of the same energy with single electrons, then pair them.

4. What is the effective nuclear charge for Aluminum metal?

5. What is the effective nuclear charge for a fluorine atom?

6. Lithium has a larger atomic radius than Bromine. Give an explanation for this.

Bromine has a larger effective nuclear charge

7. What is the correct electron configuration for chromium?
a. 1s2 2s2 2p6 3s2 3p6 4s1 3d5
b. 1s2 2s2 2p6 3s2 3p6 4s1 4d5
c. 1s2 2s2 2p6 3s2 3p6 4s2 3d4
d. 1s2 2s2 2p6 3s2 3p6 4s2 4d4
e. none of these, or more than one of these, circle all of the correct answers

8. What is the correct electron configuration for the sodium ion?
1s2 2s2 2p6

9. Why are s orbitals lower in energy (more stable) than p orbitals?
The electrons in an "s" orbital spend more time closer to the nucleus.

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