Q13 / 160 · WBJEE 2011 · Chemistry

Which one of the following has the lowest ionization energy?

A
\(1 s^2 2 s^2 2 p^6\)
Correct answer
B
\(1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^6 3 \mathrm{~s}^1\)
C
\(1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^5\)
D
\(1 \mathrm{~s}^2 2 \mathrm{~s}^2 2 \mathrm{p}^3\)

Solution

Hints: It's an alkalimetal; hence least I.P

Hence, the correct answer is option: 'B'.

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