Bromine

At ambient temperature bromine is a brownish-red liquid. It has a similarly colored vapor with an offensive and suffocating odor. It is the only nonmetallic element that is liquid under ordinary conditions, it evaporates easily at standard temperature and pressures in a red vapor that has a strong disagreeable odor resembling that of chlorine. Bromine is less active chemically than chlorine and fluorine but is more active than iodine; its compounds are similar to those of the other halogens. Bromine is soluble in organic solvents and in water.

Group17 Melting point−7.2°C, 19°F, 266 K 
Period4 Boiling point58.8°C, 137.8°F, 332 K 
Blockp Density (g cm−3)3.1028 
Atomic number35 Relative atomic mass79.904  
State at 20°CLiquid Key isotopes79Br 
Electron configuration[Ar] 3d104s24p5 CAS number7726-95-6