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Explain why NH3 is basic but BiH3 is onl...

Explain why `NH_3` is basic but `BiH_3` is only feebly basic.

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Since the atomic size of N is much smaller than that of Bi, electron density on the N atom is much higher than that on Bi atom. As a result the tendency of N in `NH_3` to donate its lone pair of electrons is much higher than that of Bi in `BiH_3`. Thus `NH_3` is more basic than `BiH_3`.
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