The atomic number determines the chemical properties of the element. The atomic number, symbol Z, is the number of protons in a nucleus. The mass number is also known as the atomic mass number. The mass number A is slightly less than the number of nucleons N, due to binding energy (binding energy is the energy released when a nucleus is formed from protons and neutrons, and is equal to the mass defect).
The mass number, symbol A, is the total number of protons and neutrons in a nucleus. The most important properties of nuclei are: The strong force, which is not understood at a fundamental level, binds the nucleons together to form a nucleus. Many of these properties can be described in terms of the collective motion of the constituent nucleons.
In physics, nuclear properties are the properties of atomic nuclei.
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