Question

Write in detail about electron gain enthalpy across a group and period ​

Answer 1

Explanation:

Electron gain enthalpy is the energy required to add an electron in a neutral atom. Because, in most of the cases atom releases energy, the electron gain enthalpies are negative. As we move from left to right in the periodic table the electron gain enthalpy (its negative value), in the same period, increases.

Variation in electron gain enthalpy in the period: 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. ... Variation of electron gain enthalpy in a group: Generally, when we move down in a group becomes less negative