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CGP EDU Academic Team
Published on: August 13, 2026
The first ionization enthalpy of carbon is greater than that of boron, whereas the reverse is true for second ionization enthalpy. Explain.
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Carbon has higher IE 1 because of smaller atomic size and greater Z eff . Removal of second electron from stable 1s 2 2s 2 configuration in case of B + requires greater energy. So, B has greater IE 2 .
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