Write a balanced chemical equation for the reaction that occurs when calcium metal undergoes a combination reaction with o2(g).

Ithink 2 is the correct

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.

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.