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www.britannica.com/science/atomic-weight

Atomic weight, ratio of the average mass of a chemical element's atoms to some standard. Since 1961 the standard unit of atomic mass has been one-twelfth the ...

en.wikipedia.org/wiki/Atomic_mass

The atomic mass (ma or m) is the mass of an atom. Although the SI unit of mass is kilogram (symbol: kg), the atomic mass is often expressed in the non-SI unit ...

en.wikipedia.org/wiki/Standard_atomic_weight

The standard atomic weight (Ar, standard(E)) of a chemical element is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element ...

www.angelo.edu/faculty/kboudrea/periodic/structure_mass.htm

The atomic mass of an element is the average mass of the atoms of an ... (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.).

ehss.energy.gov/ohre/roadmap/achre/intro_9_3.html

The total weight of an atom is called the atomic weight. It is approximately equal to the number of protons and neutrons, with a little extra added by the electrons.

www.qmul.ac.uk/sbcs/iupac/AtWt

The standard atomic weights of twelve elements having two or more stable isotopes have variability of atomic-weight values in natural terrestrial materials.

www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/average-atomic-mass

The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the ...

www.khanacademy.org/science/chemistry/atomic-structure-and-properties/introduction-to-the-atom/v/atomic-weight-calculation

How to calculate atomic weight from atomic mass and percent abundance of carbon isotopes.

www.sciencedirect.com/topics/engineering/atomic-weight

Atomic weights (M) of atoms are related to the sum of the number of protons and neutrons. But this number physically corresponds to the actual weight of an atom.

www.lenntech.com/periodic/mass/atomic-mass.htm

For chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). The lightest chemical element is Hydrogen and the ...