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.

Explanation

This is becaue of the difference in the crystal structures of thse elements. Co-ordination number of gold (12) is very high as compared to that of boron (6 or even less),. Since metals have generally high co-ordination numbers while non-metals have smaller value, gold is a metal depsite its higher ionisation potential compared to boron.