Arrange the following LiH, NaH and CsH in order of increasing ionic character.
The ionic character of bond depends on electronegativity difference between two atoms. When the electronegativity difference is larger, the ionic character is smaller. On moving down the group of alkali metals, the electronegativity decreases from Li to Cs. Hence the ionic character increases in the order LiH<NaH<CsH.
