Question

why electron gain enthalpy increases along period

Answer 1

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. Thus, the force of attraction between the nucleus and added electron increases

Answer 2

AS we go left to right in the periodic table,the electronegativity of elements increases due to which there will be more -ve electron gain enthalpy.
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