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Arrange the following: LiH, NaH and CsH...

Arrange the following:
LiH, NaH and CsH in order of increasing ionic character.

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The electronegativity of the alkali metals decreases down the group from Li to Cs. Therefore, the ionic character of their hydrides also increases in the same order, i.e., LiH `lt` NaH `lt` CsH.
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