apart from chemistry, what activities was he involved in?
He explored demographic issues,  promoted the merchant navy, and was active in improving the Russian petroleum industry.
Dmitri Mendeleev
 He explored demographic issues, sponsored studies of the Arctic Sea, tried to measure the efficacy of chemical fertilizers, and promoted the merchant navy. He was especially active in improving the Russian petroleum industry, making detailed comparisons with the more advanced industry in Pennsylvania. 
what is hassium? It is a chemical element. where is it naturally found? It is not known to occur naturally on Earth. is it used in any fusion reactions? Yes, it was used in Cold fusion. where does the name of the element come from? Under Mendeleev's nomenclature, It would be known as "eka-osmium", as in "the first element below osmium in the periodic table". what are the physical properties of the above-mentioned element? It should crystallize in the hexagonal close-packed structure. where is this used? It is used in the field of Experimental chemistry. are any precautions needed while using it? UNANSWERABLE what is the table used to describe the elements? periodic table who invented this system? Dmitri Ivanovich Mendeleev where was he born? In the village of Verkhnie Aremzyani, near Tobolsk in Siberia. when did he invent the system mentioned above? 1869
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Dmitri Mendeleev [SEP] Activities beyond chemistry
Beginning in the 1870s, he published widely beyond chemistry, looking at aspects of Russian industry, and technical issues in agricultural productivity. He explored demographic issues, sponsored studies of the Arctic Sea, tried to measure the efficacy of chemical fertilizers, and promoted the merchant navy. He was especially active in improving the Russian petroleum industry, making detailed comparisons with the more advanced industry in Pennsylvania. Although not well-grounded in economics, he had observed industry throughout his European travels, and in 1891 he helped convince the Ministry of Finance to impose temporary tariffs with the aim of fostering Russian infant industries. In 1890 he resigned his professorship at St.