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

    May 29, 2025 · 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 …

  3. The Definition of Atomic Mass or Weight in Chemistry

    Dec 7, 2019 · Atomic mass, which is also known as atomic weight, is the average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally occurring …

  4. Atomic mass - Wikipedia

    The atomic mass (relative isotopic mass) is defined as the mass of a single atom, which can only be one isotope (nuclide) at a time, and is not an abundance-weighted average, as in the case …

  5. What is Atomic Mass? - BYJU'S

    An atomic mass (symbol: ma) is the mass of a chemical element’s single atom. It involves the masses of the three atomic subatomic particles: protons, neutrons and electrons.

  6. Atomic Mass | Definition, Characteristics & Examples - Study.com

    Nov 21, 2023 · Atomic mass is the total mass of particles of matter in an atom, i.e., the masses of protons, neutrons, and electrons in an atom added together. However, electrons are so small...

  7. What is Atomic Mass? - ChemTalk

    The atomic mass of one isotope of an element is the sum of that isotopes subatomic particles: protons, neutrons, and electrons (usually of negligible mass.) Each of the atomic masses, the …

  8. Atomic Mass - Chemistry LibreTexts

    Mass is a basic physical property of matter. The mass of an atom or a molecule is referred to as the atomic mass. The atomic mass is used to find the average mass of elements and …

  9. Atomic mass - Simple English Wikipedia, the free encyclopedia

    An atomic mass (symbol: ma) is the mass of a single atom of a chemical element. It includes the masses of the 3 subatomic particles that make up an atom: protons, neutrons and electrons.

  10. What is atomic mass? Definition and characteristics

    Dec 2, 2019 · The atomic mass of a chemical element is the weighted average atomic mass of all isotopes of all single atoms that exist in the nature of an element. It includes protons, neutrons, …

  11. Atomic Mass: Definition, Units & How To Calculate - Sciencing

    Dec 28, 2020 · The atomic mass is generally defined in terms of atomic mass units (amu). The official definition is that 1 amu is 1/12 of the mass of a carbon-12 atom.