`10^(20)` atoms of an element has a mass of 4 mg. What is the atomic mass of the element?

Explanation

To find the atomic mass of the element given that \(10^{20}\) atoms have a mass of 4 mg, we can follow these steps:

### Step 1: Convert the mass from milligrams to grams.
Since atomic mass is typically expressed in grams per mole, we need to convert the mass from milligrams to grams.

\[ \text{Mass in grams} = 4 \text{ mg} \times \frac{1 \text{ g}}{1000 \text{ mg}} = 0.004 \text{ g} \]
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