If you are a Creationist the answer is God, if not then the answer is they just exist. or scientists found them and put it into the periotic table. Scientists may have discovered them, they certainly didn't invent them, and I think you mean the periodic table of elements.
The very intellegent person who invented the PB form of the table of elements was Isaac Newton. He invented the Table of Elements by testing all of the elements and recording the results.
Elements are discovered, they are not invented.
The Periodic Table Of Elements Was Invented iN 1869, By A Russian Chemist Named Dmitri Mendeleev.
it was invented so people could see the elements.
It wasn't invented. It's a natural process that was discovered in heavier elements.
The gaps represented the elements which were not discovered. When the elements were invented, they were placed into these gaps.
Dmitry Ivanovich Mendeleyev
False
Neon was never invented. It is one of the 118 fundamental elements and predates humanity by billions of years.
No one invented metal. Metals are naturally occurring elements in the earths crust (and core)
Dmitri mendeleev (1834-1907)
Approximately 52 elements had been discovered by the time Charles Macintosh invented a waterproof fabric in 1823.