# Why must you calculate the average mass of each isotope before calculating the average atomic mass of the element?

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science
chemistry

**Calculating Average Atomic Mass**

**average atomic mass**of an

**element**is the sum of the

**masses**of its

**isotopes**,

**each**multiplied by its natural abundance (the decimal associated with percent of

**atoms**of that

**element**that are of a given

**isotope**).

Also to know is, how do you find average atomic mass from Percent abundance?

The **abundance** of all of the isotopes should add up to 100%. Multiply the **mass** times the **abundance** for each isotope, then add all of the results together to get the **average atomic mass**.

**percent abundance**into decimal form by dividing by 100. Multiply this value by the

**atomic mass**of that

**isotope**. Add together for each

**isotope**to get the

**average atomic mass**.

Correspondingly, how do you calculate the average atomic mass of neon?

20.1797 u

The Number Of Isotopes That Exist For The Element. The **Atomic** Number For The Element. The Percentage Abundance Of Each Isotope.