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The mass of atoms is generally measured in amu (Atomic Mass units), where 1 amu = 1/12th the mass of an atom of carbon-12. The mass of subatomic particles may also be expressed in amu, or sometimes as the energy equivalent in eV (electron volts). Usually MeV or GeV are required to specify mass... an electron volt is a tiny amount of energy.
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∙ 14y ago
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∙ 9y agoThe Standard Unit for measuring the size of an atom is nanometer. Nanometer is equal to 10^-9 meters. Another unit that scientists use for measuring the atom size is angstrom. 1 angstrom= .1 nanometers or 10^-10 meters.
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∙ 10y agoThe SI unit for mass - any mass - is the kilogram. However, atomic particles are often measured in non-SI units, especially the unified atomic mass unit. The symbol is u.
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∙ 12y agometre and millimicron. for ex. The diameter of atom is 10 power minus10 metre. and that of nucleus is 10 power minus15.
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∙ 8y agoTraditionally these were angstroms, (one ten billionth of a metre), though picometres are also used.
(1 angstrom = 100 pm).
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∙ 14y agoThe picometer (1 pm = 10-12 m)
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∙ 12y agoatomic mass unit (amu)
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∙ 14y agoatomic size
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