Mendeleyevsk (Russian:Менделе́евск; Tatar: CyrillicМенделеев, LatinMendeleyev) is a town and the administrative center of Mendeleyevsky District in the Republic of Tatarstan, Russia, located on the Toyma River, 238 kilometers (148mi) east of Kazan. Population: 22,075(2010 Census);22,027(2002 Census);18,085(**** Census).