It depends what type of atom. The atoms of different elements are different sizes. Also, atoms aren't beads or billiard balls; there's a certain amount of uncertainty involved in determining how big they are. Very roughly: somewhere between two and twenty, depending on what element and how exactly you're measuring them.
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A nanometer is defined as a billionth of a meter. This is an extremely short length, it is microscopic.
There are 0.000000001 meters in a nanometer.
1 nanometer = 10^-9 meter 1 micron = 10^-6 meter Number of microns in 1 nanometer = (10^-9)/(10^-6) = 1/1000
1 nanometer = 1.0 × 10-6 millimeters
1 nanometre equals one billionth (10-9) of a metre.
There are 10 millimeters in 1 centimeter.