Question

which of the following has the largest negative electron gain enthalpy? 1, F. 2, U. 3, br. 4, I

Answer 1

3................................

Answer 2

Answer: The correct answer is Option 1.

Explanation:

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

$X(g)+e^-\rightarrow X^-(g)+Energy$

More the negative electron gain enthalpy, more will be the tendency to gain an electron and more stable will be the isolated negative gaseous ion.

Halogens have the largest negative electron gain enthalpy and this decreases down the group. Chlorine has the highest electron gain enthalpy because fluorine is smaller in size and extra addition of electron causes interelectronic repulsions in an atom.

All the other given atoms other than Fluorine has less negative electron gain enthalpy. Hence, the correct answer is Option 1.