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Atomic Weight Definition

Chemistry Glossary Definition of Atomic Weight

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Atomic weight is the sum of the mass of the protons and neutrons of an atom.

Atomic weight is the sum of the mass of the protons and neutrons of an atom.

Science Photo Library - ANDRZEJ WOJCICKI, Getty Images
Atomic Weight Definition: The average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally-occurring element. It is the weighted average of the masses of naturally-occurring isotopes.

Also Known As: Atomic Mass

Examples: The atomic mass of carbon is 12.011; the atomic mass of hydrogen is 1.0079

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