Question

The energy of a hydrogen atom in the ground state is
– 13.6 eV. The energy of a He+ ion in the first excited state
will be
(a) –13.6 eV (b) – 27.2 eV
(c) – 54.4 eV (d) – 6.8 eV

Answer 1

Answer:

(a)-13.6 eV

Explanation:

For the first excited state (n = 2), the energy of He+ ion (with Z = 2) will be - 13.6 eV. This is same as the ground state energy of a hydrogen atom. Similarly, for all the hydrogen like ions, the energy of the (n - 1)th excited state will be same as the ground state energy of a hydrogen atom if Z = n.

Answer 2

Answer:

Answer will be (a) –13.6