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Question

The ionisation energy will be maximum for the process :

A
BaBa2+
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B
BeBe2+
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C
CsCs+
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D
LiLi+
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Solution

The correct option is D BeBe2+
The ionisation energy will be maximum for the process, BeBe2+. Smaller is the atom, more is the energy needed to remove an electron, i.e., ionisation energy. Also, removal of two electron needs more energy.
Atomic number of Be is 4. To convert into Be2+
, two electrons are released from 2s, which are tightly attached to the nucleus, thus, it requires a large amount of ionisation energy.

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