Put these events in order from top to bottom, from the earliest to the most recent
The first atomic theory is published.
Scientists use nuclear reactions to split the atom apart.
Particles inside the atom are first discovered.
Democritus describes atoms as indivisible particles.
Aristotle describes matter as being made of four elements.
People try to convert metals to gold.
People begin listing the different kinds of metals.
Radioactivity is discovered.