Which of the following is the energy of a possible excited state of hydrogen?

Which of the following is the energy of a possible excited state of hydrogen?

A
$+ 13.6 eV$
B
$- 6.8 eV$
C
$- 3.4 eV$
D
$+ 6.8 eV$

Solution:

The energy of orbits in hydrogen atom is given by the expression

$E_{n} = - \frac{13 .6 eV}{n^{2}}$

For $n = 2, E_{2} = - 3 .4 eV$

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