structure and the periodic table:
Chemistry: GCSE (9:1)
Atom
Smallest part of an element
Element
A pure substance made of only one kind of atom
Compound
A substance made up of atoms of two or more different elements joined by chemical bonds
Mixture
A combination of two or more different substances that are not joined by chemical bonds
, Chemical symbol
A one or two letter representation of an element
Number of elements
118