Question

what is unusual about the isotopic composition of bromine ?​

Answer 1

Bromine is a chemical element with the symbol Brand atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine. Isolated independently by two chemists, Carl Jacob Löwig (in 1825) and Antoine Jérôme Balard (in 1826), its name was derived from the Ancient Greek βρῶμος ("stench"), referencing its sharp and disagreeable smell.Bromine (35Br) has two stable isotopes, 79Brand 81Br, and 30 known radioisotopes, the most stable of which is 77Br, with a half-life of 57.036 hours.