HOW DOES E-H BOND PAIRS REPULSION DECREASES WHEN ELECTRONEGATIVITY OF THE CENTRAL ATOM DECREASES?

Asked by sureshkumar kumar | 12th Feb, 2014, 10:15: AM

Expert Answer:

On moving down a group, the size of the central atom increases, electronegativity decreases. And so the ability to form bonds with H atom decreases. As a result, the strength of the E-H bond and bond dissociation energy decreases as we move down the group. 

Hence the stability of group 15 hydrides decreases as we move down the group from NH3 to BiH3

 

Answered by  | 12th Feb, 2014, 02:40: PM

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