Generally, the first ionisation energy increases along a period. But there are some exceptions one which is not an exception is

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:

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is……………

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is……………

Generally, the first ionization enthalpy increases along a period. But there are some exceptions. One which is NOT an expection is:

Generally the ionisation potential in a period increases, but there are some exceptions. The one which is not an exception is