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Question

The ionisation energy of H - atom is 13.6 eV. What will be the ionisation energy (in eV) of Li2+ ion

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Solution

Given,
The ionisation energy of hydrogen atom = 13.6 eV
We know,
Ionisation energy = 13.6Z2n2 eV
[Since ionisation energy is defined for ground state only, thus n=1]
Thus,
Ionisation enrgy (I.E)Z2
I.EHI.ELi2+=Z2HZ2Li2+
I.ELi2+=(I.E)HZ2Li2+Z2H
Therefore, the ionisation energy of Li2+ ion
= 13.6×3212 eV=122.4 eV

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