Multiple Choice
1. How many electrons can the shell with a principal quantum number of 1 hold?
a. 1
b. 2
c. 4
d. 8
ANS: B
2. How many electrons can the shell with a principal quantum number of 2 hold?
a. 1
b. 2
c. 4
d. 8
ANS: D
3. What is the ground-state electronic configuration of a nitrogen atom (nitrogen: atomic number 7)?
a. 1s22s12p4
b. 1s22s22p3
c. 1s12s12p5
d. 1s22s22p2
ANS: B
4. What is the ground-state electronic configuration of a fluorine atom (fluorine: atomic number 9)?
a. 1s12s12p7
b. 1s22s22p5
c. 1s22s22p6
d. 1s02s22p7
ANS: B
5. What is the ground-state electronic configuration of a fluoride anion (fluorine: аtomic number 9)?
a. 1s22s22p2
b. 1s22s22p5
c. 1s22s22p6
d. 1s22s22p7
ANS: C
,6. What is the ground-state electronic configuration of a sodium cation (sodium: atomic number 11)?
a. 1s22s22p63s1
b. 1s22s22p53s1
c. 1s22s22p6
d. 1s22s22p63s2
ANS: C
, 7. Which of the following species has an atom that has an unfilled valence shell of electrons?
a. molecular hydrogen, H2
b. hydroxide anion, HO
c. boron trifluoride, BF3
d. water, H2O
ANS: C
8. Which of the following species has an atоm that has an unfilled valence shell of electrons?
a. molecular bromine, Br2
b. fluoride anion, F
c. ammonia, NH3
d. aluminum trichloride, AlCl3
ANS: D
9. Which of thе following species possesses a formal charge?
a. BH3
b. BH4
c. CCl4
d. H2S
ANS: B
10. Whiсh of the following species possesses a formal charge?
a. CCl4
b. SiCl4
c. AlCl4
d. PCl3
ANS: C
11. Which of the following compounds is an aldehyde?
a. CH3CH2CH2COOH
b. CH3CH2CHO
c. CH3CH2CH2OH
d. CH3CH2COCH3
ANS: B
12. Which of the following compounds is an alcohol?
a. CH3CH2COOH
b. CH3CH2OCH3
c. CH3CH2CH2OH
d. CH3CH2CHO
ANS: C
13. Which of the following compounds is a carboxylic acid?
a. CH3CH2COOH
b. CH3CH2OCH3
c. CH3CH2CH2OH
d. CH3CH2CHO
, ANS: A