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Meaning of “atomic number” in the English Dictionary

"atomic number" in British English

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atomic numbernoun [C]

uk   /əˌtɒm.ɪk ˈnʌm.bər/  us   /əˌtɑː.mɪk ˈnʌm.bɚ/ specialized
the ​number of protonsfound in the nucleus of an ​atom of a ​particularchemical, used as a way of ​listing the ​chemicalelements in ​order in the periodictable
(Definition of atomic number from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"atomic number" in American English

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atomic numbernoun [C]

physics the number of ​protons in the ​nucleus (= ​centralpart) of an ​atom of a ​particularchemical, used as a way of ​listing the ​chemicalelements in the ​periodictable
(Definition of atomic number from the Cambridge Academic Content Dictionary © Cambridge University Press)
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