Periodic-system
[peer-ee-od-ik, peer-] /ˈpɪər iˈɒd ɪk, ˌpɪər-/
noun, Chemistry.
1.
a system of classification of the elements based on the periodic law.
/ˌpɪərɪˈɒdɪk/
noun
1.
the classification of the elements based on the periodic law
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