These gases are:
Each element can be represented by a SYMBOL. This is a shorthand
way of writing the name of the element. Sometimes the symbol is the first
letter of the English name of the element.
Some elements have a symbol of two letters to distinguish
them from other elements with the same first letter. Note that the first
letter is always a capital and the second letter is lower case.
In some cases, the symbol comes from a Greek or Latin name
for the element.
Some elements are named after famous people or places.
Each element is made up of its own particular kind of atom.