The chemical element with atomic number 35 is Bromine (Br). Bromine is a member of the halogen group in the periodic table, which also includes elements like fluorine, chlorine, iodine, and astatine.
Bromine is unique as it is one of only two elements that are liquid at room temperature, the other being mercury. It appears as a reddish-brown liquid and has a strong, unpleasant odor. Bromine is primarily used in the production of flame retardants, agrochemicals, and certain types of pharmaceuticals.
Understanding the atomic number is crucial in chemistry because it defines the number of protons in the nucleus of an atom and thus determines the chemical properties of that element.