Mass number

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A topic known well beyond its field, found in many languages.

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Notion

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Science and technology

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What Wikipedia says

The mass number (symbol A, from the German word: Atomgewicht, "atomic weight"), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

Excerpt from the Wikipedia article “Mass number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Nazrul Islam Nahid Majumder, CC BY-SA 4.0, via Wikimedia Commons.