Q8 / 54 · KVPY 2017 (5 Nov SA) · Chemistry
The first ionisation energy of $\mathrm{Na}, \mathrm{B}, \mathrm{N}$ and $\mathrm{O}$ atoms follows the order
- A$B < \mathrm{Na} < \mathrm{O} < \mathrm{N}$
- Correct answerB$\mathrm{Na} < \mathrm{B} < \mathrm{O} < \mathrm{N}$
- C$\mathrm{Na} < \mathrm{O} < \mathrm{B} < \mathrm{N}$
- D$O < \mathrm{Na} < \mathrm{N} < \mathrm{B}$
Solution
N has half filled stable configuration and Na is most electropositive element.
Hence, the correct answer is option: 'B'.