Question

how does ionisation enthalpy varies down the group?​

Answer 1

Answer:

Ionization enthalpy decreases down the group. Reason: This is because atomic size increases down the group due to the increase in number of shells. The shielding effect increases and hence effective nuclear charge decreases.

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Answer 2

Answer:

Ionization enthalpy decreases down the group. Reason: This is because atomic size increases down the group due to the increase in number of shells. The shielding effect increases and hence effective nuclear charge decreases.