There are lots of different substances but only just over a hundred elements. An element is a substance that is made up of only one kind of atom. The atoms in a particular element are the same as each ...

The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to bottom ...

The chemical symbol for oxygen is O. Makes sense. Calcium gets repped by a Ca. Sounds good. Hydrogen? H. Cobalt? Co. Lithium? Li. With you so far. Lead? Pb. There are actually a few things that help ...