Fewpal
+1 vote
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If the kinetic energy of of electron moving in fourth orbit of hydrogen is €, then the total energy in first  orbit of li 2+ is

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1 Answer

+2 votes
by (9.9k points)

Hint to find the same

We are required to find the energy required to excite doubly ionized lithium. We know that, 

En = –13.6 Z2 / n2

Hence, the excitation energy = ΔE = E3 – E1 = –13.6 × (3)2 [1/32 – 1/12]

= +13.6 × (9) [1–1/9] = 13.6 × (9) (8/9) = 108.8 eV.

Wavelength λ = hc / ΔE

by (463 points)
Answer is -144€

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