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Although first ionisation potnetial of b...

Although first ionisation potnetial of boron (8-3eV) is less than that of gold (9.22eV).yet the former is a non-metal while the latter is a metal. Explain.

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This is due to structural difference in the solid states. In general, metals have large number of atoms as neighbours-while non-metals have relatively less number of atoms as neighbours. Gold has 12 atoms as neighbours while boron has 6 or less atoms as neighbours in solid states
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