Question

First ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium. explain​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Electronic configuration of Na is 1s22s22p63s1. After losing one electron from its outermost shell, sodium easily attains stable electronic configuration (1s22s22p6 ), while magnesium does not lose its electron easily due to presence of two electrons in s-orbital (ls22s22p63s2). Hence first ionisation energy of sodium is less than magnesium.

When one electron is removed from Na and Mg, their configurations become ls22s22p6and 1s22s22p63s1 respectively. Now it is easier to remove one electron from 3s of Mg+than 2p6 of Na+. Hence, second ionisation energy of Mg is less than Na.