Question

The first ionisation enthalpy of Na, Mg and Si are 496, 731 ,776 kJ/mol respectively.

Answer 1

So? what do we have to answer here?

Answer 2

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• It will be more close to ${575kJmol^-1}$ The value for ${Al}$ should be lower that that of ${MG}$ because of effective sheilding of ${3p}$ electrons from the nucleus by ${3s}$ _electrons.