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Arrange the following in increasing order of first ionization enthalpy: Mg, Al, Si, Na

Arrange the following in increasing order of first ionization enthalpy: Mg, Al, Si, Na

Grade:11

1 Answers

Arun
25763 Points
2 years ago

The electronic configurations of Na and Mg are:

Na (11): [Ne] 3sand Mg (12): [Ne] 3sIn both the atoms, the electron is to be removed from 3s-orbital but nuclear charge in Na is less than Mg. Thus, ionisation energy of Na is less than Mg (Na
The electronic configurations of Mg and Al are:
Mg: [Ne] 3s2; Al: [Ne] 3s2 3pl
In Mg, the electron is to be removed from 3s-orbital while in Al, it is to be removed from 3p-orbital. Since it is easier to remove an electron from 3p-orbital in comparison to 3s-orbital, the ionization enthalpy of Mg is higher than Al (Mg > Al).
The electronic configurations of Al and Si are:
Al (13): [Ne] 3s2 3pSi (14): [Ne] 3s2 3p2
In both the atoms, the electron is to be removed from 3p-orbital but nuclear charge in Si is more than Al. Thus, ionisation enthalpy of Al is less than Si

 

Na Al

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