the periodic table
noun [ S ] chemistry uk/ˌpɪə.ri.ɒd.ɪk ˈteɪ.bəl/ us/ˌpɪr.i.ɑː.dɪk ˈteɪ.bəl/
元素周期表
an arrangement of the symbols of chemical elements in rows and columns, showing similarities in chemical behaviour, especially between elements in the same columns