Non-metallic elements are a group of elements that do not contain metal properties. BROMINE is a non-metallic element with 7 letters, and it is a chemical element with the symbol Br and atomic number 35. Phosphorus is another non-metallic element with 10 letters, and it is a chemical element with the symbol P and atomic number 15. HALOGEN is also a non-metallic element with 7 letters, and it is a group of five chemically related elements including fluorine, chlorine, BROMINE, iodine, and astatine.