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atomic number

   Also found in: Dictionary/thesaurus, Legal, Financial, Acronyms, Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
atomic number
n. Abbr. at. no., at no
The number of protons in an atomic nucleus; it indicates the position of an element in the periodic table.
atomic number,
n the number of protons within an atom's nucleus.
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9898), atomic number (11), and specific gravity (0.
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The atomic number and weight are listed for each element, as well as the naturally occurring isotopes and their isotopic mass, abundance, nuclear spin, and magnetic moment.
Handbook of basic atomic spectroscopic data available online by Journal of Research of the National Institute of Standards and Technology
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