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why bond length of hydrises decreases down the group 15

why bond length of hydrises decreases down the group 15

Grade:12

2 Answers

Arun
25750 Points
4 years ago
The stability of hydrides decreases from ammonia to bismuthine. This is because the central atom E increases in size down the group. With the increase in the size of the central atom, the E – H bond becomes weaker. where E is nitrogen ,phosphorus, arsenic,antimony , bismuth
Vikas TU
14149 Points
4 years ago
Dear student 
As we move down the group, the size of the element increases and, therefore, the bond length of the M—H bond increases and its strength decreases.  Thus, BiH2 is least stable among the hydrides of group 15 and hence is the strongest reducing agent.

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