Among CaH_2,BeH_2,and BaH_2,the order of ioni | vedclass

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Question

(A) The ionic character of metal hydrides depends on the electronegativity difference between the metal and hydrogen,or alternatively,on the polarizin

Vedclass · Accepted Answer

$BeH_2 < CaH_2 < BaH_2$

Vedclass · Answer

(A) The ionic character of metal hydrides depends on the electronegativity difference between the metal and hydrogen,or alternatively,on the polarizing power of the cation.According to Fajan's rule,smaller cations have higher polarizing power,which increases the covalent character of the bond.As we move down the group $2$ ($Be$ to $Ba$),the size of the cation increases,and its polarizing power decreases.Therefore,the covalent character decreases and the ionic character increases down the group.The order of ionic character is $BeH_2 < CaH_2 < BaH_2$.

Among $CaH_2$,$BeH_2$,and $BaH_2$,the order of ionic character is:

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