so that we can easy to know the measuring mass of an atom
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.0000000001
1.1 to 3.5 *10^-10 metres.
The Vander Waal radius ranges from 1.2*10^-10 to 3.5*10^-10 metres.
As far as we know, we only use scientific notation here on Earth, for the computing of very large numbers (like the distance between planets) or very small numbers (like the radius of a hydrogen atom).
1.64 nm 1.64 nanometers or 1.64 x 10-9m