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10^-10 basically means that an atom is 10 billionth of a metre. This means that 10 billion atoms can fit across in a line in 1 metre. A millimetre is a 1000th of a metre so 10 billion divided by 1000 equals 10 million. 10 million atoms fit in a straight line along a millimetre. However, you want 0.1mm. To get 0.1mm you have you divide 1mm by 10. You do the same to the atom number so 10 million divided by 10 equals 1 million.

Answer: 1 million atoms

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Q: If an atom is 10 to the power of -10 in diameter how many can you fit in a straight line across a pin head 0.1mm wide?
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