Iggy's Element Bonanza! Element: Bromine Atomic Symbol: Br Atomic Number: 35 Iggy: Bromine is the third member of the halogen family and is special because it is one of only two elements that are a liquid at room temperature! It is a reddish-brown liquid with a sharp, disagreeable smell, try not to breathe it! Bromine has two stable isotopes, Br-79 and Br-81.