The first ionization energy of boron is less than that of beryllium be

1.	The first ionization energy of boron is less than that of beryllium because
A.	Boron has higher nuclear charge
B.	Atomic size of boron is more than that of beryllium
C.	Boron has only one electron in p-sub-shell
D.	Atomic size of boron is less than that of beryllium
Answer» D. Atomic size of boron is less than that of beryllium

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The first ionization energy of boron is less than that of beryllium because

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