The correct order of ionization energy for carbon, nitrogen
and oxygen atoms is:
(a) C > N > O (b) C > N < O
(c) C < N > O (d) C < N < O
Answers
answer : option (c) C < N > O
ionisation energy is the minimum amount of energy required to remove an electron from isolated gaseous atom.
so, to get ionisation energy of given atoms we have to check electronic configuration by which we can understand which element easily eliminate its electron from ground state.
configuration of C = 1s², 2s², 2p²
configuration of N = 1s², 2s², 2p³ [ here we see 2p³ is half filed orbital so it is stable and hard to eject electron, then high amount of energy require to remove electron ]
configuration of O = 1s², 2s², 2p⁴ [ it has higher tendency to get stable state i.e., half filed 2p³ , so very low amount of energy is required to remove electron ]
hence we get,
I_C < I_N > I_O
option (C) is correct choice.
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