Why is hydrogen not a metalloid?

1 Answer
Jan 28, 2017

Because hydrogen is not a soft solid at room temperature and pressure.

In order to be a metalloid, a minimum requirement is that the element must have a reasonably well-defined shape. That is, it must be a solid with properties between those of a nonmetal and a metal.

Hydrogen is a gas at room temperature and pressure, #"H"_2(g)#.