The mass of a proton is A: substantially greater than the mass of a neutron.

B: roughly equal to the mass of a neutron

C: substantially less than the mass of a neutron

D: twice the mass of a neutron

I think it’s d or a bit hope this helps

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.