Question

A group 15 element forms \( d\pi - d\pi \) bond with transition metals. It also forms a hydride, which is the strongest base among the hydrides of other group members that form \( d\pi - d\pi \) bonds. The atomic number of the element is ________________________.

Hint:

Phosphorus forms strong \( d\pi - d\pi \) bonds and has strong basic hydrides.

Answer 1

Correct Answer: 15

The element must be from group 15 and form \( d\pi - d\pi \) bonds. Possible candidates: N, P, As.

• Phosphorus (\( P \)) forms \( d\pi - d\pi \) bonds. 
• \( PH_3 \) is a strong base compared to \( AsH_3 \).

Atomic number of Phosphorus = 15.