According to Fajan's Rule, 1. Smaller the size of cation, the larger the size of the anion, greater is the covalent character of the ionic bond. 2. Greater the charge of cation, greater is the covalent character of the ionic bond. 3. For cations with same charge and size, the one, with (n−1)dnns∘ which is found in transition elements have greater covalent character than the cation with ns2np6 electronic configuration, which is commonly found in alkali or alkaline earth metals. Thus, order of covalent character is: NaCl<LiCl<BeCl2 I Caution Larger the anion, less is the effective nuclear charge that holds the valence electron of the ion in place. Since the last electron is loosely bound in large anions, it can easily be polarised by a cation, thereby making the compound more covalent.
The correct sequence of increasing covalent character is represented by:
NEET UG 2005 — Chemistry Inorganic Chemistry
The correct sequence of increasing covalent character is represented by:
Held on 30 Apr 2005 · Verified 9 Jul 2026.
Options
- A
LiCl<NaCl<BeCl2
- B
BeCl2<LiCl<NaCl
- C
NaCl<LiCl<BeCl2
- D
BeCl2<NaCl<LiCl
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