account for the following. 1_first ionisation enthalpy of boron is less than that of carbon. 2_first member of the group differs from the rest of the members of the same group
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A1 .The first ionisation enthalpy of carbon is more than that of boron because the effective nuclear charge of carbon is more and its atomic size is smaller as compared to boron.
A2.1st element of a group, have smaller size and high IP, also they dont have d-orbitals so they show different properties like valency, ionic character, maximum valency solubility.
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