Single Choice

In which of the following, the order is not in accordance with the property mentioned?

A$$Li < Na < K < Rb$$ - Atomic radius
B$$F > N > O > C$$- Ionisation enthalpy
C$$Si < P < S < Cl$$ - Electronegativity
D$$F < Cl < Br < I$$ - Electronegativity
Correct Answer

Solution

Atomic radius increases down the group as the shell size increases. In group 1 order is: $$LiIonization enthalpy increases from left to right in a period due to an increase in effective nuclear charge. Due to the extra stability of fully filled and half-filled configurations ionization of $$N>O$$ and the order is thus $$F>N>O>C$$
Electronegativity increases from left to right and decreases from top to bottom. Thus in group 3, we have the order: $$SiCl>Br>I$$.

Electronegativities of halogens are not in correct order. Hence, the answer is option $$D$$.

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