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Question: The energy of an electron in the Ist orbit of H-atom is— 13.6 eV. The possible energy values of the ...

The energy of an electron in the Ist orbit of H-atom is— 13.6 eV. The possible energy values of the excited state for electrons in Bohr orbits of Li2+ ions is/are-

A

–3.4 eV

B

–30.6 eV

C

–13.6 eV

D

Both B & C are correct

Answer

Both B & C are correct

Explanation

Solution

En = –13.6Z2n2\frac{13.6Z^{2}}{n^{2}} for Li2+, En = – 13.6×9n2\frac{13.6 \times 9}{n^{2}}

= 122.4n2\frac{- 122.4}{n^{2}} eV

If n = 1 , En = – 122.4 eV

If n = 2 , En = – 30.6 eV

If n = 3 , En = – 13.6 eV