Question

explain changes of value of electron gain enthalpy of period and groups​

Answer 1

Explanation:

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.

pls mark me as brainlist pls.