Question

The element with positive electron gain enthalpy is
(a) hydrogen
(b) sodium
(c) oxygen
(d) neon

Answer 1

the answer is hydrogen

Answer 2

The element with positive electron gain enthalpy is neon

Explanation:

Electron gain enthalpy is the amount of energy released when an isolated gaseous atom accepts an electron.

The general electronic configuration of neon is $1s^22s^22p^6$ and thus can not easily gain an electron as its octet is already complete. Electron gain enthalpy of neon is positive as large amount of energy will be absorbed to gain an electron.

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