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Democritus made the first atomic model.

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Aristotle proposed that all things are made up of the four elements: fire, water, air, earth. He believed all materials on earth were made up of small amounts of each element.

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This is the model of the atomic theory Dalton proposed.

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Thompson was the first person to propose the idea of negatively charged electrons and unknown positive charges.

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Rutherford said that the atom has an atomic nucleus containing protons and neutrons. He also stated that the electrons go around the nucleus in a electron orbit, but he died before he could prove his theory.

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Bohr proposed the theory that the electrons orbit the nucleus in a predetermined route.

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Heisenberg and Schrodinger took Bohr's atomic model and solved math equations to figure out the probability of finding an electron in a certain spot. The atomic model created by Heisenberg and Schrodinger is known as the quantum mechanical model of the atom.

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The atom we know today is made up of a nucleus, protons, electrons, and neutrons. The nucleus holds protons and neutrons in its core, and electrons orbit the nucleus. We can now confirm that all things are made up of atoms, atoms can be split, atoms can be combined to create molecules, and atoms are not all the same. The number of protons in an atom determine what element it belongs to, although they all may have the same number of protons each atom of a certain element may not be the same in mass and weight.