The first ionisation enthalpy of sodium is lower than that of magnesium but the second ionisation enthalpy of sodium is higher than that of magnesium.Why?
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Hence, the first ionization enthalpy of sodium is lower than that of magnesium. However, the second ionization enthalpy of sodium is higher than that of magnesium. This is because after losing 1 electron, sodium attains the stable noble gas configuration of neon (1s22s22p6) .
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