What's Inside an Atom?

An Atom is the smallest part of an element that can exist on its own
In other words, if you have a bar of solid gold, the smallest particle that could exist by itself and still be considered gold would be one atom of gold. Atoms have 3 parts Protons, Neurons and Electrons, Neurons and Protons make up the dense centre of an Atom Called "Nucleus". Atoms can only be seen with a powerful electron microscope. The First one to split an Atom was Ernest Rutherford.