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how to calculate the average mass of an element. To calculate the average atomic mass of chlorine use the information in a periodic table of the element see Resources to find the weighted average but changing the percents to decimals. 2 Find the relative atomic mass of the element.
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A weighted average is defined as 4141 Atomic Weight abundance isotope 1 100 mass of isotope 1 abundance isotope 2 100 mass of isotope 2. Understand isotopes and atomic masses. In order to solve this dilemma we define the atomic weight as the weighted average mass of all naturally occurring occasionally radioactive isotopes of the element.
The weighted average of the isotopes of each element grounded in nature by their abundance is the atomic weight of an element.
4 5 a m u. A list of isotopes with natural abundance and mass is given either as a percentage or decimal value. This quantity takes into account the percentage abundance of all the isotopes of an element which exist. Look up the mass of each isotope.
