Isotopes and Average Atomic Mass

Atoms or nuclei with the same number of protons are the same element.

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How to calculate average atomic mass

To calculate Average Atomic Mass:
1. Multiply the Atomic Masses of the isotopes by their Natural abundance percentage and add them all together.

2. the percentage used must first be divided by 100 before being used in the calculation

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General Rule

Note:
Dont Forget to divide the percentages by 100 before using them in the calculations.

Example 1

Average Atomic Mass = M₁ x P_1/100 + M₂xP_2/100

Example 2

Average Atomic Mass = M₁ x P_1/100 + M₂xP_2/100 + M₃xP_5/100

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