How to classify an unknown element as a metal, metalloid, or non-metal

You can classify a metal: when a subject can surely conduct electricity.

examples: if a problem says the unknown object is malleable, or says "on the left side of the periodic table", is a conductor, is shiny, etc.

Metalloids: when a subject is alongside the staircase, uses word "semi-conductor", it depends on if it's malleable or ductile, and depends on whether it's shiny or not, etc.

Nonmetal: is located on the right side of the periodic table, can ONLY be an insulator, is not malleable, is not shiny, etc.

Deposition is the transition of matter going from gas to solid without passing through the liquid phase.a.) gas—-> solid