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Why is the first ionization of beryllium is greater than boron

Why is the first ionization of beryllium is greater than boron
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Why is the first ionization of beryllium is greater than boron

User Niels Lucas
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It's because of the electron configuration of both of the atoms:

*beryllium:
₄Be: 1s² 2s²

*boron:
₅B: 1s² 2s² 2p¹

Boron has one unpaired electron and it's easier to remove it than the paired one.
User Auburg
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