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Q.3. The ionisation energy of a hydrogen atom is 13.6 ev. The energy of the ground level in doubly ionised lithium is
(1) - 28.7 ev
(2) - 54.4 ev
(3) - 122.4 ev
(4) - 13.6 ev

Apply the formula thatI.E.=-13.6Z2eV Since for Lithium, Z=3, we get I.E. = -13.6Z2eV =-13.6(3) 2eV =-122.4 eV

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