alleryThe minimum energy required to remove an electron from the ground state of a hydrogen atom is:
A$3.4\,\text{eV}$
B$13.6\,\text{eV}$
C$27.2\,\text{eV}$
D$1.51\,\text{eV}$
Answer & Solution
Correct answer: B. $13.6\,\text{eV}$
Ionisation energy is the energy required to take the electron from $n = 1$ to $n = \infty$.
$E_\infty - E_1 = 0 - (-13.6) = 13.6\,\text{eV}$.
The value $27.2\,\text{eV}$ is the magnitude of the potential energy in the ground state, not the ionisation energy.
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