Question

Hey mate... pls ans
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Why ionisation enthalpy Dec down the group​

Answer 1

Answer:

Number of shells increase .

Atomic size increases

nuclear force of attraction decrease due to that. electron will not be easily added so less energy is released

Answer 2

Hey mate,

Down the group, the number of shells increase i.e., the size of the atom also increases

So basically the distance of the outer electron increases from the nucleus, effectively the nuclear attraction or nuclear charge decrease

Hence it become more easier to remove the outer electron and hence the ionisation enthalpy decreases.

Hope it helps