Led reacts vigorously with fluorine at room temperature. Chlorine, which is in the same vertical group as fluorine, react dangerously with lead when heated. Why might these two elements react so much with lead?

I'm not sure but i will try to find out

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.