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In Greece, in 400 B.C.E., Democritus discovered that the universe and all matter is composed of atoms.

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In Manchester, England, in 1803 John Dalton discovered that all matter is composed of atoms, indivisible and indestructible building blocks. All atoms of an element are identical but different elements have atoms of differing size and mass

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In Russia, in 1911, Dmitri Mendeleev arranged the 63 elements based on mass into the periodic table.

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In Cambridge, England, in 1897, JJ Thompson discovered the electron and he demonstrated that cathode rays were negatively charged.

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In New Zealand, in 1911, Ernest Rutherford discovered that an atom has a tiny and heavy nucleus.

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In Denmark, in 1913 Niels Bohr discovered that energy is transferred only in certain well defined quantities.

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In Austria, in 1926, Erwin Shrodinger used math equations to describe the likelihood of finding an electron in a certain position, called the quantum mechanical model of the atom.