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  1. Oxford Dictionary

    periodic law

    • n.
      a law stating that the elements, when listed in order of their atomic numbers, fall into recurring groups, so that elements with similar properties occur at regular intervals.

    • noun: periodic law

    • 更多解釋

    periodic law

    • IPA[ˌpirēˌädik ˈlô]

    美式

    • n.
      a law stating that the elements, when listed in order of their atomic numbers (originally, ...

    Oxford American Dictionary