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Assume that the atomic diameter of an atom of element X is 2A and that 1.0 x 10(16th) atoms are arranged in a simple 2D square array. What is the length of each side in cm?

3 answers

I would draw a 2D square. Each side is 1E8 atoms. If each atom is 2E-8 cm (that's 2 Angstroms each), then
1E8 atom x (2E-8 cm/atom) = ?
Is it 2E-11?
I don't think so. How do you add 8 and -8 and get -11.
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