What is the chemical formula for the binary compound composed of al3+ and o2- ions?

The charge of the whole compound =0.
+3*2 -2*3=0

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.