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Find the ionisation energy of a doubly ...

Find the ionisation energy of a doubly lonized lithium atom.

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The correct Answer is:
A, B, D
`Z = 3 for doubly ionized atom E prop Z^2`
lonization energy of hydrogen atoms is 13.6 eV.
`:.` lonisation energy of this atom
`(3)^2(13.6)
=122.4 eV
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