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Among the elements B, Al, C and Si,

(i) which element has the highest first ionisation enthalpy?

(ii) which element has the most metallic character? Justify your answer in each case.

Answers (1)

(i) Moving along a period, ionisation enthalpy increases and moving down a group ionisation enthalpy decreases. Therefore, C or Carbon has the highest first ionisation enthalpy.

(ii) The metallic character increases while moving down the group and decrease along a period, so, Al has the most metallic character.

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