Dictionary

atomic number

atomic number

noun

Definition of ATOMIC NUMBER

:  an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table — see element table

First Known Use of ATOMIC NUMBER

1821

Rhymes with ATOMIC NUMBER

atomic number

noun atomic num·ber \-ˈnəm-bər\   (Medical Dictionary)

Medical Definition of ATOMIC NUMBER

:  an experimentally determined number characteristic of a chemical element that represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table—see element table

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