Question

arrange the following according increasing order of covalency?(i) CaF2,CaAl2,CaBr2,CaI2(ii) NaF,NaCl,NaBr,NaI(iii)LiF,NaF,Kf,Rbf,CsF​

Answer 1

covalent character is proportional to size of cation and directly proportional to size of anion.
in this
1 - same cation,so we consider anion.CaF2<CaAl2<CaBr2<CaI2

2 -same cation .so we consider anion. NaF <NaCl <NaBr <NaI

3-same anion.so we consider cation.LiF>NaF>KF>RbF>CsF


size generally increases on moving down the group.


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