Question

Which of the following will have positive electron gain enthalpy?

(A) Na + e^⊝ →  Na^⊝ 

(B) O + 2e^⊝ →  O^2⊝ 

(C) Be + e^⊝ →  Be^⊝

(D) F + e^⊝ →   F^⊝ 

(E) N + e^⊝ →   N^⊝ 

(1) (B, C, E) 

(2) (A, B, E) 

(3) (A, C, D) 

(4) (A, B, C)

Answer 1

Correct answer is: (1) (B, C, E) 

Be & N have stable fully filled & half-filled electronic configuration respectively