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atomic number
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    Also found in: Medical, Encyclopedia, Wikipedia 0.09 sec.

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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Helium atom number 7, however, altered the picture dramatically.
Super spinner: seven-atom speck acts like superfluid by Weiss, P. / Science News
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