Average Atomic Mass and Percent Abundance

Flashcards covering key terms and concepts related to average atomic mass and percent abundance.

Average Atomic Mass

The mean relative mass of the atoms of the different isotopes in an element.

Isotopes

Most elements occur as a mixture of these. Scientists average the masses of these to get an average. This average is the mass found on the periodic table.

Percent Abundance

Refers to the proportion of a specific isotope in a sample; expressed as a percentage.

Abundance of Magnesium-24

79%

Abundance of Magnesium-25

10%

Abundance of Magnesium-26

11%

Abundance of Bromine-79

52%

Abundance of Bromine-81

48%

Abundance of Silicon-28

90%

Abundance of Silicon-29

8%

Abundance of Silicon-30

2%