a) 2,
b) 14,
c) 16,
d) 18
7. Which element in group 15 is most metallic?
a) N,
b) P,
c) Ti,
d) Bi
8. What is the total number of elements in period 2 that are all gases at STP,
a) 1,
b) 2,
c) 4,
d) 8
9. Which represents the electronic configuration of a metalloid in ground state
a) 2-3,
b) 2-5,
c) 2-8-5,
d) 2-8-6
10. Which element in group 14 will more likely to form Chlorides of the formula
MCl .2
a) C,
b) Si,
c) Sn,
d) Pb
11. To what oxidation state would we assign the elements X and Y respectively
in the table below?
X
786
1,577
3,228
4,354
16,100
Y
1,060
1,890
2,905
4,950
6,270
21,200
a) 2 & 3,
b) 4 & 5,
c) 5 & 6,
d) 1 & 1.
12. By Paulings electronegativity method, what is the likely bond type for mole-
cule AB, where bond energies for A-B = 3.8, A-A = 4.5 and B-B = 2.7 eV?.
a) moderately ionic, b) pure covalent, c) ionic, d) covalent.
13. Inert pair effect is likely to be experienced in,
a) group 1, b) upper group 2, c) lower group 14,d) lower group 17.
African Virtual University
14. Calculate the effective nuclear charge for a sulphur atom,
a) 16,
b) 8,
c) 6,
d) 10.
15. What is the electronic configuration for bromine atom in ground state?,
a) [Kr]4s24p5,
b) [Ar]4s24p7, c) [Ar]4s24p5, d) [Ar]3s23p5.
16. A polar bond is more likely to be formed between,
a) Na and Cl,
b) Mg and O, c) Na and F.
d) H and O,