`2 xx 10^(8)` atoms of carbon are arranged side by side. Calculate the radius of carbon atom if the length of this arrangement is 3.0 cm

Explanation

To solve the problem of calculating the radius of a carbon atom when `2 x 10^8` atoms are arranged side by side in a length of `3.0 cm`, we can follow these steps:

### Step 1: Understand the relationship between length, number of atoms, and radius
The total length of the arrangement is equal to the number of atoms multiplied by the diameter of one atom.

### Step 2: Write the formula
Let \( r \) be the radius of a carbon atom. The diameter \( d \) of a carbon atom is given by:
\[ d = 2r \]
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