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 ________________________.

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Phosphorus forms strong \( d\pi - d\pi \) bonds and has strong basic hydrides.
Updated On: Mar 17, 2025
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Correct Answer: 15

Solution and Explanation

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.
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