Variations on The Periodic Table of the Elements (science trivia)
A Periodic Table of the Elements indicates relationships between different atomic elements' properties and natures. A chemical element is one or more atoms of the same type. The tables all begin with hydrogen (H), the simplest and most common element in the universe.
Aside from hydrogen, all other atoms have increasing numbers of subatomic particles. Helium is the second element, followed by over 100 other atomic elements having a diversity of chemical and physical properties.
Most people have seen a rectangular periodic table of elements. There are dozens of other formats, some of which are circular.
A database of various styles of periodic tables is located here.
The http://www.chemicalgalaxy.co.uk/ is one example. (That is a large pic; it might load slowly).