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The energy of the electron in the $n = 2$ level of a hydrogen atom, taking $E_{1} = - 13.6 eV$ , is

A $- 13.6 eV$
B $- 6.8 eV$
C $- 3.4 eV$
D $- 1.51 eV$

Answer: C

For hydrogen

E_{n} = E_{1} / n^{2}

. For

n = 2

:

E_{2} = - 13.6/4 = - 3.4 eV

.

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