Question

increasing electron gain enthalpy​

Answer 1

Answer:

As we move from left to right in the periodic table the electron gain enthalpy (its negative value), in the same period, increases. And as we move from top to bottom in a group, it decreases. When we move from left to right the positive charge in the nucleus increases, hence more energy is released to add an electron.

Explanation:

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Answer 2

Answer:

Electron gain enthalpy becomes more and more negative from left to right in a period. As we move across a period from left to right the atomic size decreases and the nuclear charge increases. Both these factors tend to increase the attraction by the nucleus for the incoming electron.