Question

If the energy of the election revolving in the 2nd orbit
of H-atom be E2, the energy of the electron nevolving
in the 3rd orbit of He 2+ ion will be -​

Answer 1

Answer:

The energy of electron in Bohr's model is directly proportional to Z

2

/n

2

.

Therefore the energy of electron in 2nd orbit of He

+

is 4 times the energy of electron in 2nd orbit of Hydrogen.

Note: Bohr's model can be applied to single electrons system only.