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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