Why is the ionisation enthalpy of Hydrogen higher than that of sodium?

Answers (1)

Hydrogen has a higher ionization enthalpy than sodium because sodium has a different configuration that is in the last shell, the electron is in 3s, which if lost, the configuration resembles neon, which is the noble gas. However, with Hydrogen, the case is different, and the electron is in the 1s orbital which on losing doenot amount to attainement of noble gas configuation.

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