The first ionization enthalpy of O …

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The first ionization enthalpy of O is less than N. Why ?
  • 1 answers

Adithya Dev A 1 month ago

Electronic configuration of O = 1s2 2s2 2p4 and that for N = 1s2 2s2 2p5. Here, in N, the 2p subshell already has a HALF FILLED electronic arrangement unlike in O. This ensures greater stability for N atom than for O atom and thus, ionisation enthalpy (energy required to remove outermost electron) for O becomes lesser in magnitude than that for N.
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