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Increasing Ionization

APCHEM-MO8NKM

Which of the following is the BEST explanation for why ionization energy generally increases left to right across the periodic table?

A

Electrons are found in different shells as the atomic number increases across a period.

B

More electrons are added to atoms as the atomic number increases across a period, increasing the electron-electron repulsions.

C

Electron affinity increases as the atomic number increases in a period.

D

There are more protons as the atomic number increases in a period, increasing the effective nuclear charge.