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Class 8-9-10, JEE & NEET
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Assertion (A): Boron has a smaller first ionisation enthalpy than beryllium.Reason (R): The penetration of a 2s electron to the nucleus is more than the 2p electron hence 2p electron is more shielded by the inner core of electrons than the 2s electrons.
(i) Assertion and reason both are correct statements but the reason is not the correct explanation for the assertion.
(ii) The assertion is a correct statement but the reason is the wrong statement.
(iii) Assertion and reason both are correct statements and reason is the correct explanation for the assertion.
(iv) Assertion and reason both are wrong statements.
Option (iii) is correct.