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1. Oxford American Dictionary

   atomic number

   • IPA[əˌtämik ˈnəmbər]

   美式

   • n.
     the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

   • noun: atomic number, plural noun: atomic numbers

2. • 更多解釋

   atomic number

   • IPA[əˌtɒmɪk ˈnʌmbə]

   英式

   • n.
     the number of protons in the nucleus of an atom, which is characteristic of a chemical element ...

   Oxford Dictionary