Question

(a) Use the noble-gas notation and write the ground-state electronic configurations of the following ions:

(i) S2- (ii) Sn4+ (iii) Mn2+

(b) Write the equation representing the 2nd ionization energy for Co.
(c) The electron affinity of Cs is 45 kJ/mol. Write the equation for which this is the energy change.

(d) Each of the following oxides reacts with water to produce an acid or a base, depending on whether the oxide is an acidic or a basic oxide. Give the formula of the product of this reaction.

(i) Cl2O3 (ii) Na2O (iii) N2O5

Answer 1

A)

1) S2- - [Ne] 3s2, 3p6

2) Sn4+ -  1s2, 2s2, 2p6, 3s2, 3p6, 3d10, 4s2, 4p6, 4d10

OR [Kr] 4d10

3) Mn2+ - [Ar] 3d5

B)

Co(g) -----> Co(g) + e- (first ionization)

Co+(g) -----> Co2+(g) + e- (second ionization)

C)

Cs + 1e- -----> Cs- , H = 45 KJ/mol

D)

Cl2O3 + H2O ----> 2HClO2 (acid)

Na2O + H2O ----> 2NaOH (base)

N2O5 + H2O ---> 2HNO3 (acid)