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

**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**).

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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**.

Beside above, how do you calculate atomic mass with percent abundance and isotopes? Change each **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

What 3 types of information are needed to calculate an average atomic mass?

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