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1926                 Austria
Erwin took the bohr model one step further by making it even more advanced. Using mathematical equations to describe the likelihood of finding an electron in a certain position. This model is known as the quantum model.

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1922                Denmark
Came up with the Atomic Theory:
This stated that matter is indivisible and made up of tiny particles. Also created the Bohr model which shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.

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1911        New Zealand
Ernest was the first to discover that atoms have a small charged nucleus surrounded by largely empty space. He created the Rutherford model to demonstrate and show the atom with a nucleus.

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1897       United Kingdom
He created the electrons theory which stated that electrons flow and can be defined as a moving charge. Created the plum pudding model which showed the nucleus in order to include the electron into the atomic model.

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1869                     Russia
Most important contributor to the development of the periodic table. He believed that elements should be organized into rows according to their atomic mass and into columns based on chemical and physical properties.

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1803                England
stated:
1. All mater is made of atoms
2. Atoms are invisible & indestructible
3. Compounds are formed by a combination of 2 or more atoms
All atoms of an element were identical, different elements had atoms of differing size and mass

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370 BC      Abdera, Thrace
Believed everything in the universe was made up of atoms, which were microscopic and indestructible. Stated atoms are solid, homogeneous, indivisible, and unchangeable.