For the last fifty or so years, the periodic table has been incomplete. Elements after uranium on the periodic table have been synthesized for the past few decades, but there were always a few ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...

Katie: Time for some science. And today it's a chemistry classic, the periodic table. And here to explain H to the Cs to the Ns and the Os, it's our super scientist extraordinaire, Dr Tim Gregory.