Katie: Time for some science. And today it's a chemistry ... We call these letters symbols. And an element is a pure substance made from only one type of atom. And there are quite a lot of elements.

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table’s arrangement also allows ... Today, with 118 known ...

When it comes to science, chemistry is elemental ... while also giving each individual element its own chemical symbol. In ...