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Periodic Trend: Ionization Energy

10. Periodic Properties of the Elements / Periodic Trend: Ionization Energy / Problem 4

Why does boron have a lower ionization energy than beryllium?

A

The filled s subshell of beryllium is more stable.

B

Electrons in the subshells of beryllium experience more repulsions.

C

Beryllium has a smaller effective nuclear charge (Zeff) than boron.

D

Boron has a smaller atomic radius which makes it easier to remove a valence electron.

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