Bromine Has Two Naturally Occurring Isotopes, Br-79 and Br-81

question 121

Multiple Choice

Bromine has two naturally occurring isotopes, Br-79 and Br-81. The mass of Br-79 is 78.92 u with a percent abundance of 50.69%. If the atomic mass of bromine is 79.904 u, calculate the mass and percent abundance of Br-81.

• A) 80.916 u and 50.69%
• B) 78.921 u and 49.31%
• C) 79.904 u and 49.31%
• D) 80.916 u and 49.31%
• E) 80.028 u and 50.31%

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Definitions:

Positive

Having a value of more than zero; often refers to electric charge associated with protons.

Oxygen Balance

A concept in chemistry that helps in assessing the degree to which an explosive can be oxidized; it measures the relative amounts of oxygen and combustible elements in a compound.

Explosive

A reactive substance that contains a great amount of potential energy and can produce an explosion when released suddenly, usually accompanied by the generation of light, heat, sound, and pressure.

Explosions

Explosions are rapid expansions of matter resulting in a quick release of energy, often accompanied by the production of heat, light, sound, and shock waves.