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Why does ionic character of hydrides of alkali metals decreases from LiH to CsH, while according to bond length and bond strength, CsH should have highest ionic character?

Why does ionic character of hydrides of alkali metals decreases from LiH to CsH, while according to bond length and bond strength, CsH should have highest ionic character?

Grade:11

2 Answers

Kirmani
15 Points
5 years ago
Because their electronegativity decreases down the group.Down the group the electron loosing ability increases due to increasing size so ionic character increases down the group..... 
Deepansh
13 Points
5 years ago
Hydride of alkalie metals include hydrogen as a -ve charged..Since  H- is very small in size.. .we know that the smaller anion is stabilised by the smaller cation.. Therefore LiH will have the strongest bond with high lattice energy,.. Stronger will bethe bond and hence they will hold a stronger ionic character..  But down the group the bond weakens and hence the ionic character

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