Question

(a) Arrange F, Cl, Br and I in increasing order of electron affinity. 

(b) Predict the position of the element with atomic number 26 in the periodic table. 

(c) Why I.E. of oxygen is less than that of nitrogen?

Answer 1

(a) I < Br < F < Cl is increasing order of electron affinity. 

(b) It belongs to group 8 of periodic table because its electronic configuration is [Ar] . 4s² 3d⁶. 

(c) It is because nitrogen has stable electronic configuration, i.e., half filled p-orbitals. Therefore, its I.E. is more than that of oxygen.