Featured this week Arsenic Arsenic is a chemical element with the symbol As, an atomic mass of 74.921 595, and an atomic number of 33. It is in the pnictogens group of the periodic table and its element category is Metalloid. Arsenic has a metallic grey..
Featured this week Bromine Bromine is a chemical element with the symbol Br, an atomic number of 35, and an atomic mass of 79.904. It is in the halogen element group.  At ambient temperature bromine is a brownish-red liquid. It has a similarly coloured