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The diameter of an atom ranges from about 0.1 to 0.5 nanometer

The neutron has a positively charged core of radius ≈ 0.3 fm surrounded by a compensating negative charge of radius between 0.3 fm and 2 fm. The proton has an approximately exponentially decaying positive charge distribution with a mean square radius of about 0.8 fm.[13]

1 A = 100.000 fm

"A proton has a diameter of approximately one-millionth of a nanometer" 10 elevat a -15 metres

1 Armstrong = 0,0000000001 m 

(deu elevat a menys 10 metres)


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