No, Dmitri Mendeleev did not know about protons. The concept of protons was not discovered until later in the 20th century, after Mendeleev's time. Mendeleev is most famous for creating the periodic table of elements.
Yes, Dimitri Mendeleev (1834-1907) was alive during the discovery of radon (1899-1903).
Dimitri Mendeleev was born on February 8th, 1834.
Independently by Dmitri Mendeleev and Lothar Meyer in 1869
Mendeleev was born in the village of Verkhnie Aremzyani, near Tobolsk in Siberia.
Dmitri Mendeleev
Dmitri Mendeleev.
Dmitri Mendeleev
It was predicted by Dmitri Mendeleev in 1869, but discovered in 1886 by Clemens Winkler.
Dmitri Mendeleev
He was Russian
In 1869, a total of 63 elements had been discovered by. A few were gases. Two were liquids. Most were solid metals.
Most chemists attribute the discovery to Dmtri Mendeleev.
Dmitri Mendeleev and Lothar Meyer
Mendeleev left gaps for eight elements in his periodic table that were yet to be discovered. These gaps eventually corresponded to the elements gallium, germanium, scandium, technetium, francium, and technetium.
Dmitri Mendeleev was married to Anna, his second wife, in 1882
Dmitri Mendeleev published his periodic table in 1869.