Question

Which of following pair is not isoelectronic
Nh2- , Hf

Answer 1

Answer:

Species Number of electrons

(i) NH 3 7+1×3=10

(ii) CH 3 6+1×3−1=8

(iii) NH 2 7+1×2+1=10

(iv) NH 4 7+1×4−1=10

Since (i), (iii) and (iv) contain the equal number of electrons, so these are called isoelectronic species.