PERIODIC LAW
\pˌi͡əɹɪˈɒdɪk lˈɔː], \pˌiəɹɪˈɒdɪk lˈɔː], \p_ˌiə_ɹ_ɪ__ˈɒ_d_ɪ_k l_ˈɔː]\
Definitions of PERIODIC LAW
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(chemistry) the principle that chemical properties of the elements are periodic functions of their atomic numbers
By Princeton University