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Atomic mass

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Understanding Atomic Number and Atomic Mass

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Atomic Mass

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In Depth: Atomic Mass Units | Properties of Matter | Chemistry | FuseSchool

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Atomic Number & Mass Number | Properties of Matter | Chemistry | FuseSchool

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GCSE Science Revision Chemistry "Relative Atomic Mass"

The atomic mass (ma) is the mass of an atom. Its unit is the unified atomic mass units where 1 unified atomic mass unit is defined as ​1⁄12 of the mass of a single carbon-12 atom, at rest. For atoms, the protons and neutrons of the nucleus account for almost all of the mass, and the atomic mass measured in u has nearly the same value as the mass number.
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    • Relative isotopic mass 

    • Similar terms for different quantities 

    • Mass defects in atomic masses 

    • Measurement of atomic masses 

    • Relationship between atomic and molecular masses 

    • History