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Lived in the ancient Greek times about 500 B.C. He believed that all matter was made of extremely small particles that could not be broken down or divided. The thought atoms in liquid were round and smooth, but the atoms in solids were roughand prickly.
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He didn't think there was a limit to the number of times matter could be divided. He thought there were four elements Earth, Air, Fire, Water. With four different qualities hot, cold, dry, and wet.
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Dalton proposed the theory that all matter is made up of induvidual particles called, atoms which can be divided.
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He believed that when materials are rubbed together they gain the ability tto attract or repel other materials.
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Believed atoms had a central nucules and the electrons move in small orbits like the rings surrounding Saturn.
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He believed that an atom has a dense and positively charged nuclues, with electrons that moved around randomly and freely in the space surrounding the nucleus.
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He believed that the electrons moved in circular orits at a fixed distance around the nuclues.
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Discovered the idea that particles in motion show properties of waves. Later scientest prove his theory correct.
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He conducted a math problem to discribe the movement of electrons in atoms.
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He proves the existence of neutrons . The Atomic nuclei has newtrons and positively charged protons.
