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CGP EDU Academic Team
Published on: August 14, 2026
Which of the following is the correct order of ionisation enthalpy ?
(1) Be + > Be (2) Be > Be +
(3) C > Be (4) B > Be
Text Solution
Verified by ExpertsThe correct answer is:
A
Be has completely filled stable valence shell configuration i.e. 2s 2 while in Be +
because of positive charge, the removal of electron requires much higher energy. So, ionisation energy of Be + is greater than Be.
Across the period, atomic size decreases and nuclear charge increases and thus valence shell electron(s) is/are tightly held by nucleus. So, ionisation energy of C is greater than Be.
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