None. A line is a 1-dimensional object and so has no thickness. An atom, no matter how small, has a finite thickness and so cannot be IN a line.
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There are: 460 mm = 46 cm
To change cm to mm, simply multiply by 10. 46*10=460 mm
Approximately 100,000,000. This assumes the atoms are one Angstrom apart, which is actually a little closer than you can pack most of them; for larger atoms, half of that would be a reasonable number.
If we assume that the distance between each atom is about 1 Angstrom (1×10−10m) apart, we can calculate that there are approximately 100,000,000 atoms in a 1cm line, give or take depending on the size of the atom.
circumference = pi*46 cm