Meaning of “atomic number” in the English Dictionary

british 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 protons found in the nucleus of an atom of a particular chemical, used as a way of listing the chemical elements in order in the periodic table

(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 (= central part) of an atom of a particular chemical, used as a way of listing the chemical elements in the periodic table

(Definition of “atomic number” from the Cambridge Academic Content Dictionary © Cambridge University Press)