Dmitri Mendeleev in 1869. He was a Russian chemist. There were only 63 known elements at that time.
The periodic table of elements arranges all of the known chemical elements.
All chemical elements are placed in the perodic table of elements of Mendeleev.
At last count we were up to 114.
check this perodic table at www.calculatoredge.com
He is famous for making the Perodic Table of elements which is a table (chart) of elements such as solds, liquids or gasses. He was born in Russia and is known for one of the best scients in history.
I think it was Mendaleev's periodic table.
Phosphorus
meercury , lead
Copper
check out an interesting periodic table at www.calculatoredge.com
Search: Groups on Periodic Table on google.
Check out the perodic table of elements if you haven't already. There are quite a few words ending in -ium. Aside from that, opium is valid.