Arrange na. mg and k in order of increasing first ionization energies

Arrange Na, Mg and K in order of increasing first ionization energies

K < Na < Mg
Na < K < Mg
Mg < K < Na
Na < Mg < K
Mg < Na < K

Answer

Electron configurations:

Arrange Na, Mg and K in order of increasing first ionization energies

K = [Ar] 4s1

Na = [Ne] 3s1

Mg = [Ne] 3s2

First, let us study 3s level:

Na and Mg; note tht 1st ionizaiton energy for Mg must be higher than that of Na, since Na is only 1 electorn away from noble gas configuration

Mg > Na

now, compare s1 species, K and Na

Since Na is smaller, the electrons are nearest to the proton, therefore the eneryg required is higher than that of K

Na > K

Therefore, by logic:

Mg > Na > K

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