A group 15 element forms $\mathrm{d} \pi-\mathrm{d} \pi$ bond with transition metals. It also forms hydride, which is a strongest base among the hydrides of other group members that form $\mathrm{d} \pi-\mathrm{d} \pi$ bond. The atomic number of the element is $\_\_\_\_$。
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Solution
Phosphorus belongs to $15^{\text {th }}$ group and forms $\mathrm{d} \pi-\mathrm{d} \pi$ bond with transition metal and $\mathrm{PH}_{3}$ is strongest base among the other group members except $\mathrm{NH}_{3}$.
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