Men·de·ley·ev, Dmi·tri I·van·o·vitch /ˌmendəˈleɪev, dəˈmiːtri ɪˈvɑːnəvɪtʃ/ BrE AmE
(1834–1907) a Russian scientist who invented the ↑ periodic table , which is a list of all the ↑ element s (=basic chemical substances) arranged according to their ↑ atomic number