Question

Ionisation potential of boron is less than that of beryllium. This is because :

• A. B has $1s^{2}2s^{2}2p^1$ configuration
• B. B has small atomic size
• C. B has higher nuclear charge
• D. B has more number of shells

Answer 1

Answer: (A)

B has $1s^{2}2s^{2}2p^1$ configuration

Be has stable fully filled s-orbital configuration. B will attain this configuration after losing one electron. Thus, B loses an electron more easily. Therefore, B has less ionization energy than Be.