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He said that matter was "continuous" or always present. -
Suggested that all matter was made of tiny particles that determined the property of the matter -
They thought that sulfur and mercury made up all metals. They paved the way of experimenting about the atomic theory by believing in a set list of laws about the universe. -
He supported atomism (the belief that matter is made up of small particles) and experimented on existing elements in an attempt to prove it. He also proved oxygen's existence. -
He grouped the elements as simple substances, metals, non-metals, and earthly substances. -
Said that all matter is made up of atoms; atoms of certain elements are identical; and that elements/matter cannot be destroyed. -
Said that equal volumes of gas that are at the exact same temperature and pressure have the same amount of molecules despite their different properties -
Made a periodic table with spaces for elements that had not been discovered yet -
Discovered that atoms consisted of smaller components -
Said that rays given off by radium and polonium were caused by atoms disintegrating inside the elements -
Proved the existence of atoms -
Discovered the charge of an atom and learned that electrons all had the same negative charge -
Said that atoms had a positively charged core called a nucleus and that electrons with a negative charge circled the nucleus -
Mosely's Law: Frequencies are proportional to the squares of whole numbers that are equal to the atomic number and a constant. -
Said that electrons move around the nucleus in a prescribed orbit and when electrons jump from the orbit, they cause radiation -
Proved the existence of the neutron, a part of the nucleus with neutral charge