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  4. The ionization energy of Li2+ is equal to

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Q. The ionization energy of $Li^{2+}$ is equal to

KCETKCET 2007Atoms

Solution:

Ionization energy $=R ch Z^{2} $
$Z=3$ for $ Li ^{2+} $
$\therefore $ Ionization energy $=(3)^{2} R c h=9 R c h$