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How would you explain the fact that first ionisation enthalpy of sodium is lower than that of magnesium but it's second ionisation enthalpy is higher than that of magnesium

Posted by Anmol Molu 6 years, 9 months ago

CBSE > Class 11 > Chemistry

1 answers

Ak Dinesh 6 years, 9 months ago

Sodium has ns^1 electrons in its outermost shell.soo it is easier to remove electron from half filled state.whereas in magnesium,it has ns^2 electrons.where its valence shell is filled so it is harder remove its first electron.But after removing 1 electron sodium is stable and magnesium is half filled.so it is harder than magnesium that of sodium.

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