Q143. Bromine has two naturally occurring isotopes, 79Br and 81Br, with relative abundances of 50.51% and 49.49% respectively. What is the average atomic mass of bromine?Chemistry — NUST Mock By IBAGRADS 2 — Question 143 of 200A. 81B. 80C. 79.5D. 79Practice more Chemistry MCQs for entrance exam preparation on Examora.io.← Previous Question Next Question →