Ionisation energy of He+ is 19.6×10-18J atom-1. The energy of the first stationary state (n = 1) of Li2+ is
(1)8.82×10-17 J atom-1
(2) 4.41×10-16 J atom-1
(3) -4.41×10-17 J atom-1
(4) -2.2×10-15 J atom-1
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Given I.E = 19.6×10-18
I.E ∝ z2
(I.E) Li2+/He+ = (9/4)×19.6×10-18
= -4.41×10-17
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