Question

The subshell electronic configuration of two elements ends as follows. (Symbols are not real) 

P – 3s² Q – 3p⁴ 

a. Write the complete subshell electronic configuration. 

b. Find out the oxidation state of each element. 

c. The chemical formula of the compound formed by these elements is PQ. Is this statement correct? Justify your answer.

Answer 1

a. P – 1s² 2s² 2p⁶ 3s² 

Q – 1s² 2s² 2p⁶ 3s² 3p⁴ 

b. P = +2, Q = – 2 : 

c. Right, valency of both P and Q is ‘2’

Answer 2

The d-block is in the middle of the periodic table and encompasses elements from groups 3 to 12; it starts in the 4th period