Asked by paulie

The diameter of a neutral helium atom is about 128 pm. Suppose we could lin up helium atoms side by side in contact with one anohter. Approximately how many atoms would it take to make the distance 1 cm from end to end.

Answers

Answered by drwls
(10^-2 m)/(128*10^-12 m/atom)
= 7.8*10^9 atoms

About 8 billion.
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