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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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.

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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Correct Answer: 15

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