The first ionisation energy of beryllium is more than that of boron becauseA. boron has higher nuclear chargeB. boron has only one electron in p-subshellC. atomic size of boron is less than that of berylliumD. atomic size of boron is more than that of beryllium

The first ionisation energy of beryllium is more than that of boron be

1.	The first ionisation energy of beryllium is more than that of boron becauseA. boron has higher nuclear chargeB. boron has only one electron in p-subshellC. atomic size of boron is less than that of berylliumD. atomic size of boron is more than that of beryllium
Answer» Boron has only one electron in p-subshell, hence it can be lost easily, while beryllium has comparatively stable configuration `(1s^(2), 2s^(2))` hence, cannot given an electron easily, consequently itas IE is greater.

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The first ionisation energy of beryllium is more than that of boron becauseA. boron has higher nuclear chargeB. boron has only one electron in p-subshellC. atomic size of boron is less than that of berylliumD. atomic size of boron is more than that of beryllium

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