Question

.On moving top to bottom in group ionisation potential decreases. why?​

Answer 1

Explanation:

bcause from top to bottom in the element valence electron enters in a new subshell so atomic radius increases

due to increase in atomic radius the attraction force between nucleus and electron goes on decrease

therefore electron can easily remove

hence ionisation potential decreases

Answer 2

On the periodic table, first ionization energy generally decreases as you move down a group. This is because the outermost electron is, on average, farther from the nucleus, meaning it is held less tightly and requires less energy to remove.

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