atomic number Definition in the Cambridge English Dictionary
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Definition of “atomic number” - English Dictionary

Definition of "atomic number" - American English Dictionary

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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 periodic table
(Definition of atomic number from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "atomic number" - British English Dictionary

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atomic numbernoun [C]

uk   us   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 Learners Dictionary & Thesaurus © Cambridge University Press)
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