Mass number Guide, Meaning , Facts, Information and Description
The mass number (A), also called nucleon number, is the number of protons and neutrons in an atomic nucleus. The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol. For example, carbon-12 (12C) has 6 protons and 6 neutrons. The full isotope symbol would also have rhe atomic number (Z) as a subscript to the left of the element symbol directly below the mass number: 126C.
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