An undated photograph of the Russian chemist Dmitri Mendeleev (public domain; https://commons.wikimedia.org/wiki/File:%D0%94%D0%BC%D0%B8%D1%82%D1%80%D0%B8%D0%B9_%D0%98%D0%B2%D0%B0%D0%BD%D0%BE%D0%B2%D0%B8%D1%87_%D0%9C%D0%B5%D0%BD%D0%B4%D0%B5%D0%BB%D0%B5%D0%B5%D0%B2_12.jpg).

The Russian chemist #DmitriMendeleev, who formulated the #periodiclaw and created a version of the #periodictable of elements, was born on 8 February in 1834 according to the Gregorian calendar (27 January by the Julian calendar).

An 1897 black-and-white photograph of the Russian chemist Dmitri Mendeleev. Photographer unknown, from the collection of Mikhail Mikhailovich Shultz (public domain; https://commons.wikimedia.org/wiki/File:DIMendeleevCab.jpg).

The Russian chemist #DmitriMendeleev, who formulated the #periodiclaw and created a version of the #periodictable of elements, was born on 8 February in 1834 according to the Gregorian calendar (27 January by the Julian calendar).

A 1861 black-and-white photograph of Dmitri Mendeleev. By Sergey Lvovich Levitsky (public domain; https://commons.wikimedia.org/wiki/File:1861._%D0%9F%D0%BE%D1%80%D1%82%D1%80%D0%B5%D1%82_%D0%94.%D0%98._%D0%9C%D0%B5%D0%BD%D0%B4%D0%B5%D0%BB%D0%B5%D0%B5%D0%B2%D0%B0.jpg).

The Russian chemist #DmitriMendeleev, who formulated the #periodiclaw and created a version of the #periodictable of elements, was born on 8 February in 1834 according to the Gregorian calendar (27 January by the Julian calendar).

The Russian chemist #DmitriMendeleev, who formulated the #periodiclaw and created a version of the #periodictable of elements, was born on this day, 8 February, in 1834 according to the Gregorian calendar (27 January by the Julian calendar).

A black-and-white photograph of the Russian chemist Dmitri Mendeleev. Photographer unknown (public domain; https://commons.wikimedia.org/wiki/File:%EB%93%9C%EB%AF%B8%ED%8A%B8%EB%A6%AC_%EB%A9%98%EB%8D%B8%EB%A0%88%EC%98%88%ED%94%84.jpg).

The Russian chemist #DmitriMendeleev, who formulated the #periodiclaw and created a version of the #periodictable of elements, was born on 8 February in 1834 according to the Gregorian calendar (27 January by the Julian calendar).