alleryThe ionisation energy of hydrogen in its ground state is
A$13.6\,eV$
B$3.4\,eV$
C$1.51\,eV$
D$27.2\,eV$
Answer & Solution
Correct answer: A. $13.6\,eV$
$IE = |E_1| = 13.6\,eV$ for H. Equivalent to $1312\,kJ\,mol^{-1}$ — the most famous number in atomic chemistry.
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