The Cold War arms race, Ancient Egyptian make-up and medieval laxatives. What do all these things have in common? They all have a link to the periodic table, which turned 150 in 2019! Here are ...

In 1869, Mendeleev's first periodic table did not include them, as closed-shell elements remained undiscovered until Lord Rayleigh and William Ramsey isolated argon in 1894.

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 ...