Atomic weight
Atomic weight
Atomic weight (pronounced /əˈtɒmɪk weɪt/), also known as relative atomic mass (pronounced /rɪˈleɪtɪv əˈtɒmɪk mɑːs/), is a dimensionless physical quantity defined as the average mass of atoms of an element, scaled by the atomic mass unit (pronounced /əˈtɒmɪk mɑːs ˈjuːnɪt/).
The term "atomic weight" is derived from the Greek word "atomos" (pronounced /ˈætəmɒs/), meaning "indivisible", and the English word "weight" (pronounced /weɪt/), which is derived from the Old English "gewiht", meaning "a measure of weight".
Related terms
- Atomic number (pronounced /əˈtɒmɪk ˈnʌmbər/): The number of protons found in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- Molar mass (pronounced /ˈmoʊlər mæs/): The mass of a given substance divided by the amount of that substance, measured in moles.
- Isotope (pronounced /ˈaɪsətoʊp/): Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei.
See also
External links
- Medical encyclopedia article on Atomic weight
- Wikipedia's article - Atomic weight
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