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 OB. Na and MgC. Mg and AID. Be and B

The ionisation energy `(IE_(1))` of an atom is defined as the energy n

1.	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 OB. Na and MgC. Mg and AID. Be and B
Answer» Correct Answer - B

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