Question

# Polarising action of $$Cd^{2+}$$ an anions is stronger than that of $$Ca^{2+}$$ because:

A
the charges of the ions are same
B
their radii are same (Ca2+ = 0.104 nm, Cd2+=0.099 nm)
C
the Ca2+ ion has a noble-gas electron configuration, and the Cd2+ ion has an 18 electron configuration in its outer shell
D
all of the above

Solution

## The correct option is B the $$Ca^{2+}$$ ion has a noble-gas electron configuration, and the $$Cd^{2+}$$ ion has an 18 electron configuration in its outer shellCations with 18 electrons shall have greater polarising power than the cation with 8 electron shell.the linear electron has a poor shielding effect on the nucleus and thus E.N of the 16-electron shell is increased.Cadmium ion $$({ Cd }^{ 2+ })$$ has atronger polarsing power than $$({ Ca }^{ 2+ })$$ due to the above stated fact $$({ Cd }^{ 2+ })$$ has 18 electrons configration where as $$({ Cd }^{ 2+ })$$ ion has an noble gas configration ( 8 electron shell).Chemistry

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