Acompound has 39 g of potassium and 78 g of selenium. what is the mass ratio of potassium and selenium in the compound

The ratio is 1:2 because there are 39 g of potassium and 78 g of selenium                                   

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.