The ionization energy of atoms
A)decreases going across a period.
B)decreases going down within a group.
C)increases going down within a group.
D)does not change going down within a group.
E)None of the above.

Question

Quizplus · Accepted Answer

Ionization energy decreases going down a group because the outer electrons are farther from the nucleus and are shielded by inner electrons, making them easier to remove.

The Ionization Energy of Atoms