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atomic number

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atomic number

Number of protons in the nucleus of an atom. It is equal to the positive charge on the nucleus. In a neutral atom, it is also equal to the number of electrons surrounding the nucleus. The chemical elements are arranged in the periodic table of the elements according to their atomic number. Nuclear notation is used to label an atom according to the composition of its nucleus.



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Handbook of basic atomic spectroscopic data available online by Journal of Research of the National Institute of Standards and Technology
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