7. The correct chemical symbol for magnesium is Mg mg MG mG 8. The smallest part of an element is called A mixture A molecule An atom An ion 9. When two elements combine, the name of the compound will usually end in -ate -ide -ite -ium 10. An element is a substance that Can be split up by physical methods Can be split up into simpler parts by a chemical reaction Is made up of different kinds of atom Is made up of only one kind of atom