First slide

Periodicity in atomic properties

Question

Which has maximum polarising power?

Moderate

A

${Na}^{+}$
B

${Mg}^{2 +}$
C

${Al}^{3 +}$
D

${Si}^{4 +}$

Solution

By Fajan's rule, smaller the size of cation, larger the size of anion, larger the charge on the ion. d,f-electrons present then, larger the polarising power and larger the distortion hence, larger the covalent nature of compounds. Si" with largest charge and smallest size has maximum polarising power.

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