Thu May 31, 2012 By: V Raja

the ionization energy of boron is less than beryllium. why?

Expert Reply
Fri June 01, 2012
The most easily removed electron in Boron is that in the 2p orbital, higher in energy than the 2s electrons in Beryllium. It therefore needs less energy for total removal than does the 2s electron of Boron. This outweighs the effect of the increased nuclear charge of Boron, which tends to make its outer electron harder to remove.

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