"Prominent Russians: Dmitry Mendeleev" "Prominent Russians: Dmitry Mendeleev" Russian chemist الأصل Russian chemist Russian chemist Russian chemist "Prominent Russians: Dmitry Mendeleev" “Prominent Russians: Dmitry Mendeleev” Russian chemist Prominent Russians: Dmitry Mendeleev Russian chemist "Prominent Russians: Dmitry Mendeleev" "Prominent Russians: Dmitry Mendeleev" الأصل Russian chemist "Prominent Russians: Dmitry Mendeleev" "Prominent Russians: Dmitry Mendeleev" “Prominent Russians: Dmitry Mendeleev” Russian chemist Russian chemist