Let me share with you something.To many atoms touching at once would explode like a nucular warhead.so to answer your question around 1 billion atoms.but remember they would explode.
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1,000,000,000 atoms lined up side by side will equal 1 meter * * * * * I disagree. The diameter of a copper atom is approx 250 picometres = 2.5*10-10 metres. You would therefore require 4 billion atoms.
Each side would be 208.7 feet long.
19 km or 11.8 miles
Find the length of each side, then add them all together. For example, if you have a square, and each side is 4 inches, you would add them all up. 4+4+4+4 = 12
If the area was a square, each side would measure 1,320 feet (1/4 mile).