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  2. Atomic mass unit | Definition, Description, Uses, & Facts ...

    www.britannica.com/science/atomic-mass-unit

    Atomic mass unit (AMU), in physics and chemistry, a unit for expressing masses of atoms, molecules, or subatomic particles. An atomic mass unit is equal to 1 12 the mass of a single atom of carbon-12, the most abundant isotope of carbon, or 1.660538921 × 10 −24 gram.

  3. Atomic mass unit Definition & Meaning - Merriam-Webster

    www.merriam-webster.com/dictionary/atomic mass unit

    The meaning of ATOMIC MASS UNIT is a unit of mass for expressing masses of atoms, molecules, or nuclear particles equal to 1/12 the mass of a single atom of the most abundant carbon isotope 12C —called also dalton.

  4. Atomic mass - Wikipedia

    en.wikipedia.org/wiki/Atomic_mass

    The atomic mass of atoms, ions, or atomic nuclei is slightly less than the sum of the masses of their constituent protons, neutrons, and electrons, due to (per E = mc 2). Atomic mass is often measured in dalton (Da) or unified atomic mass unit (u). One dalton is equal to 1 ⁄ 12 the mass of a carbon-12 atom in its natural state.

  5. Dalton (unit) - Wikipedia

    en.wikipedia.org/wiki/Dalton_(unit)

    The dalton or unified atomic mass unit (symbols: Da or u, respectively) is a unit of mass defined as ⁠ 1 / 12 ⁠ of the mass of an unbound neutral atom of carbon-12 in its nuclear and electronic ground state and at rest.

  6. 2.2: Atomic Number, Mass Number, and Atomic Mass Unit

    chem.libretexts.org/Courses/University_of...

    The atomic mass unit (u or amu) is a relative unit based on a carbon-12 atom with six protons and six neutrons, which is assigned an exact value of 12 amu's (u's). This is the standard unit for atomic or molecular mass, and 1 amu is thus 1/12 th the mass of a 12 C atom.

  7. Atomic Mass Unit Definition (AMU) - ThoughtCo

    www.thoughtco.com/definition-of-atomic-mass-unit...

    In chemistry, an atomic mass unit or AMU is a physical constant equal to one-twelfth of the mass of an unbound atom of carbon -12. It is a unit of mass used to express atomic masses and molecular masses.

  8. Atomic mass | Definition, Units, & Facts | Britannica

    www.britannica.com/science/atomic-mass

    Atomic mass, the quantity of matter contained in an atom of an element. It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, which is assigned an atomic mass of 12 units. In this scale, 1 atomic mass unit (amu) corresponds to 1.66 x 10^−24 gram.