Periodic Trends: Ionization Energy

Distance between valence electron and nucleus

Effective nuclear charge (# of protons)

Number of neutrons

Type of chemical bond

The energy required to remove an electron from a gaseous atom

The energy released when an electron is added to an atom

The energy required to split a nucleus

The energy released during chemical bonding

Ionization energy decreases with each electron removed.

Ionization energy remains the same for each electron removed.

Ionization energy increases with each electron removed.

Ionization energy fluctuates randomly.

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

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

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

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