What will be the correct order of decreasing covalent characters alkali metals?

Question

What will be the correct order of decreasing covalent characters alkali metals? (A)  MF>MCl>MI>MBr  (B)  MF>MCl>MBr>MI  (C)  MCl>MI>MBr>MF  (D)  MI>MBr>MCl>MF

Tardigrade Admin · Accepted Answer

In question, the metal ion is common, only anion is change. So, according to Fajans rules, as the size of the anion (halogen) increases, the covalent character increases and ionic character decreases

Q. What will be the correct order of decreasing covalent characters alkali metals?

$MF > MCl > M I > MB r$

$MF > MCl > MB r > M I$

$MCl > M I > MB r > MF$

$M I > MB r > MCl > MF$

In question, the metal ion is common, only anion is change. So, according to Fajans rules, as the size of the anion (halogen) increases, the covalent character increases and ionic character decreases