Question

What is electron gain enthalpy? The values of electron gain enthalpy become more negative as we move from left to right in the period? Explain giving reasons.

Answer 1

Definition ,
Electron Gain Enthalpy is the energy released when one mole of electronare added to gaseous atoms of an element. Electron Affinity is the same as Electron Gain Enthalpy but viewed as the energy supplied to the surroundings rather than that released by the atoms. Hence its sign is opposite from the latter


Electron affinity generally becomes more negative on moving from left to right along a period. It is because onmoving across a period, the atomic size decreases. As a result, the force of attraction exerted by the nucleus on the electron increases. Consequently, the atom has a greater tendency togain an electron.

Answer 2

Answer:

In the modern periodic table, on moving from left to right across a period, the atomic size of elements decreases and the effective nuclear charge increases. Thus, the force of attraction between the nucleus and added electron increases. Hence, electron gain enthalpy becomes more negative while moving right across a period.

Explanation:

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