Among elements b,al,c,si which has highest first ionisation enthalpy
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aluminium due to its half filled p orbitals
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Hence carbon has highest ionization enthalpy. Carbon has the highest first ionization enthalpy among them. The order is C>B>Si>Al as Al and Si are in 3rd period and henceforth have one extra shell of electrons so it is easier to remove electrons from them.
Explanation:
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