Mass Number Notes: Definitions & Explanations PDF Download
Study Mass Number lecture notes PDF with college chemistry definitions and explanation to study “What is Mass Number?”. Study mass number explanation with college chemistry terms to review chemistry course for online degree programs.
Mass Number Definition:
Total number of protons and neutrons in the nucleus of an atom is called mass number.
Cambridge International AS and A Level Chemistry by Ryan Lawrie, Roger Norris
Mass Number Notes:
The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It determines the atomic mass of atoms The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number (Z) which denotes the number of protons in a nucleus. Hence, the difference between the mass number and the atomic number gives the number of neutrons (N) in a given nucleus. The mass number is written either after the element name or as a superscript to the left of an element's symbol.
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