- The number of protons in the nucleus, called the atomic number (atomic number), denoted by the symbol. Z
- the number of neutrons in the nucleus called neutron number denoted by n
- the total number of protons and neutrons, the particles inside the nucleus. The number of nucleon-called mass number (mass number), denoted by the
symbol of a nuclear-
X is the symbol of the element
A is the mass number (mass Number)
is the atomic number Z (atomic number).
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