Why is the ionization energy of soium less than that of magnesium

1.	Why is the ionization energy of soium less than that of magnesium
Answer» ANSWER: MAGNESIUM atom has a SMALLER radius and higher nuclear charge than a sodium atom, thus more energy will be required to remove the electron from the same orbital (3S), MAKING the first ionisation energy of magnesium higher than that of sodium.

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MAGNESIUM atom has a SMALLER radius and higher nuclear charge than a sodium atom, thus more energy will be required to remove the electron from the same orbital (3S), MAKING the first ionisation energy of magnesium higher than that of sodium.

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Why is the ionization energy of soium less than that of magnesium

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