What three letters were used to substitute the last 3 letters in Chlorine?

Noble gases is far right

C) electrons encircling a nucleus with neutrons and protons

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.