Lesson 1 - C4 - Looking for Patterns
In the 17th Century the chemis Robert Boyle wrote the modern definition of an element. This states than an element is a substance that cannot be broken down into anything simpler.
Antoine Laviosier used this definition to explain how elements burn togather in oxygen to form compounds.
The chemist John Dalton proposed that all elements were made up of tiny particles called atoms. Atoms could not be broken up and were identical in the same element. In 1802 he produced the first list of the relative atomic mass of 20 elements. The reletave atomic mass was the mass of an atom of…