The noble gases (Helium, Neon, Argon etc.) were not discovered until much later ... Unfortunately for Meyer, his work wasn’t published until 1870, a year after Mendeleev’s periodic table had been ...

There are currently 118 known elements on the periodic table, and we've put 20 of them below to create a brain game that ...

neon and xenon (1898). It was debated whether the 'inert' monoatomic gases belonged to the periodic table owing to their lack of 'chemical properties'; elements coming late to the party ...

118 Elements and Their Symbols and Atomic Numbers: The periodic table is a well-organized chart that contains all the known elements in the universe.These elements are building blocks of matter ...