# Problem: The radius of an atom of gold (Au) is about 1.35 Å.How many gold atoms would have to be lined up to span 5.5 mm ?

###### FREE Expert Solution

We are asked to calculate the number of gold atoms that have to be lined up to span 5.5 mm given the radius of an atom of gold (Au) is about 1.35 Å.

To solve this problem, we shall follow these steps:

Step 1: Convert the radius from Å to mm.

Step 2: Divide the length (i.e. 5 mm) with the diameter in mm.

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###### Problem Details

The radius of an atom of gold (Au) is about 1.35 Å.

How many gold atoms would have to be lined up to span 5.5 mm ?