definition 1) atomic number
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Atomic number
The atomic number of an element is determined by the number of protons in it, and it is used to differentiate one element from another.
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The atomic number of an atom is equal to the number of protons in the nucleus of an atom or the number of electrons in an electrically neutral atom. Atomic number = Number of protons. For example, in a sodium atom, there are 11 electrons and 11 protons.
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