Question

The first ionisation potential in electron volts of nitrogen
and oxygen atoms are respectively given by
(a) 14.6, 13.6 (b) 13.6, 14.6
(c) 13.6, 13.6 (d) 14.6, 14.6

Answer 1

The ionization energies are 14.5 and 13.6 respectively.

Option (A) is correct.

Explanation:

Consider the electronic configurations of Nitrogen and Oxygen.

N - 1s^2 2s^2 2p^3  

O - 1s^2 2s^2 2p^4  

• If oxygen loses one electron, it will attain half filled configuration.
• Hence it can lose an electron easily.
• Also, nitrogen is  already in a half filled configuration.

Hence losing an electron will require more energy than that of oxygen.

Thus the ionization energies are 14.5 and 13.6 respectively.

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