CHM 101- Exam Questions

1. Which of the following has a positive charge?

(A) proton

(B) neutron

(D) electron ANS = A

2. How many electrons are there in the valence shell of the O2–

ion?

A 2

B 8

C 10

D 16 ANS = B

3. What is the formula of the compound formed between magnesium and oxygen?

A MgO

B Mg2O2

C Mg2O3

D MgO2 ANS = A

3. Which one of the following statements concerning elements in the Periodic Table is

correct?

A Elements of the same group all have the same number of electrons in the outermost

occupied electron shell.

B Elements of Group 16 occur as cations in ionic compounds.

C Oxides of elements in Groups 16 and 17 are basic.

D The halogens are all gases at room temperature. ANS = A

4. Which one of the following species has the same electron configuration as Al3+

cation?

A. F

– B. Cl– C. S

2– D O–

ANS = A

5. Which of the following has a positive charge?

(a) proton

(b) neutron

(d) electron