Question

Increasing ionization energy ranked?

A) Decreases across a period
B) Increases across a period
C) Decreases down a group
D) Increases down a group

Answer 1

Ionization energy increases across a period and decreases down a group.

Step-by-step explanation:

The ionization energy of elements increases across a period and decreases down a group. Across a period, ionization energy increases because the number of valence electrons increases and the electrons are pulled in tighter to the nucleus. Down a group, ionization energy decreases because the valence electrons are further away from the nucleus and experience less pull.