Why is the ionisation enthalpy of hydrogen higher than that of sodium?
(N/A) Both hydrogen and sodium have one electron in the valence shell. However,the atomic size of hydrogen is much smaller than that of sodium. Consequently,the valence electron in hydrogen is much closer to the nucleus and experiences a stronger electrostatic force of attraction. Therefore,the ionisation enthalpy of hydrogen $(1312 \ kJ \ mol^{-1})$ is significantly higher than that of sodium $(496 \ kJ \ mol^{-1})$.
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