Q. 47

In the following

Answer :

(i) Assertion and reason both are correct statements and reason is correct explanation for assertion.

Boron has [He]2s22p1 configuration and after donating one electron it attains stable configuration therefore it has smaller first ionisation enthalpy than beryllium which has a completely filled s orbital as it a configuration [He]2s2. As 2p electrons are shielded by the inner electrons so it is easy to remove an electron from these orbitals and their ionisation energy decreases.

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