The energy of the $n = 3$ level of hydrogen is:
A$-13.6$ eV, the ground state energy of hydrogen
B$+3.4$ eV, the positive value at the second level
C$-1.51$ eV, since $E_3 = -13.6/9$ in the Bohr formula
DZero, since the electron is far from the nucleus
Answer & Solution
Correct answer: C. $-1.51$ eV, since $E_3 = -13.6/9$ in the Bohr formula
$E_3 = -13.6/3^2 = -13.6/9 \approx -1.51$ eV.
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