Question 108

What is the general first-ionization-energy trend when moving downward through a group?

It generally decreases.Correct answer
It generally increases.
It is always exactly unchanged.
It becomes equal to atomic radius.

Explanation

First ionization energy generally decreases down a group because the outer electron is farther from the nucleus and more shielded by inner electrons. Predicting a steady rise from proton count alone ignores those added shells and their shielding effect.

Explanation

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