In nature, bromine occurs primarily as two stable isotopes, 79Br and 81Br. Which isotope is slightly more abundant and therefore the most common isotope of bromine?

• A. ${\mathrm{Br}}^{80}$
• B. ${\mathrm{Br}}^{81}$
• C. ${\mathrm{Br}}^{79}$
• D. ${\mathrm{Br}}^{82}$

Answer: (C)