Question
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
drwls
(10^-2 m)/(128*10^-12 m/atom)
= 7.8*10^9 atoms
About 8 billion.
= 7.8*10^9 atoms
About 8 billion.