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When: Sometime between 460 B.C. and 370 B.C.
Where: Abdera
Theory: Everything is composed of atoms which are physically invisible, but not geometrically

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When: 1803
Where: Manchester
Theory: Chart of atomic weight

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When: 1869
Where: Saint Petersburg
Theory: He constructed the first periodic table.

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When: 1897
Where: UK
Theory: The electron theory. Negative charge.

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When: 1911
Where: New Zealand
Theory: Atoms have a small charged nucleus

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When: 1913
Where: Copenhagen
Theory: Energy is transferred only in certain well defined quantities.

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When: 1926
Where: Vienna
Theory: Wave Equation