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democritus's atomic theory
Matter is composed of empty space through which atoms move. Atoms are solid, homogeneous, indestructible, and invisible. Diffrent kinds of atoms have different sizes and shapes. The different properties of matter are due to the size, shape, and movement of atoms. Apparent changes in matter result from changes in the atoms themselves -
dalton's atomic theory
All matter is composed of extremely small particles called atoms. All atoms of a given element are identical, having the same size, mass, and chemical properties. Atoms of a specific element aare diffrent from other elements. Atoms can't be created, divided into smaller particles, or destroyed. Different atoms combine in simple wholenumbers ratios to form compounds. In a chemical reaction, atoms are separated, combined, or rearranged. -
JJ Thomson's atomic theory
Founded the electron -
albert einstein's atomic theory
published his famous equation E=mc 2 -
ernast ruthford's atomic theory
Gold foil experiment which proves that atoms are mostly empty space and a positivly charged nucleous -
Aristotle's atomic theory
Aristotle belived that an atom was fire, water, earth, and fire
