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The ionisation energy (IE(1)) of an atom...

The ionisation energy `(IE_(1))` of an atom is defined as the energy needed to remove an electron from gaseous atom in its ground state. The 2nd ionisation energy `(IE_(2))` is the additional energy needed to remove the 2nd electron and so on. The successive ionisation energy of any species is increasing always.
Generally, the first ionisation energy increase along a period. But there are some exceptions. One which is not an exception is:

A

N and O

B

Na and Mg

C

Mg and AI

D

Be and B

Text Solution

Verified by Experts

The correct Answer is:
B
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