What happens to the ionization energy as one goes down a group?

Jan 21, 2017

Ionization energy decreases down a Group, a column of the Periodic Table......

Explanation:

We examine the process:

$M \left(g\right) + \Delta \rightarrow {M}^{+} \left(g\right) + {e}^{-}$

Simple electrostatics supports the given principle. As the valence electron becomes farther removed from the positive nucleus, the electrostatic force of attraction should diminish. And indeed it does.

See the wiki entry for details.