a
He
b
Xe
c
Ar
d
Rr
Explanation
Correct Option
aVideo Explanation
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Discussions (5)

DEWIZO
2 years ago
yeah very correct
the lower the number of electron in the element, the higher the energy required for it to get ionized(ionization energy) , which is number of electron is inversely proportional to ionization energy , the the lower the number of electron , the higher the ionization energy, while the higher the number of electron , the lower the ionization energy
helium there have the lowest number of electron which is 2 , so he should have the highest ionization energy
thank you 






Diddywealth
2 years ago
ionization energy increases across the Period and decrease down the Group. Thanks

