The Student Room Group

which element in period 3 has the highest 2nd ionisation energy?

which element in period 3 has the highest 2nd ionisation energy?
It should be sodium because it is the only element in period 3 to have its second electron to be lost in the previous sub shell, so that electron is closer to the nucleus than for the other period 3 elements, so nuclear forces are stronger, and there is less shielding from other shells.

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