I wonder... 3

I wonder who named all the gases on the periodic table?

The first person who named all the gases was the Russian scientist named Dmitri Mendeleev in 1869 and put the known elements into their places on the periodic table based on their properties. The sample of chlorine created by Humphry Davy in 1810. it is named after the Greek word for 'green'. 

Their chosen names were influenced by changing of languages, cultures or 'our' understanding of chemistry.

How many elements are there on the periodic table?

There are currently 118 elements on the periodic table, but I think their might still be more elements that have yet to be discovered.

What was the first element on the periodic table ever discovered?

The first elements discovered were:
-Gold
-Silver
-Tin
-Copper
-Lead
& Mercury

They have been known since 1649 when Hennig Brand discovered Phosphorous.