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♡ Introduced the idea that atoms are the basic building blocks of mater.

♡ Believed that atoms are tiny, uncuttable, solid particles that are surrounded by empty space and constantly moving at random.

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♡ Determined that oxygen was a key substance in combustion, and he gave the element its name.
♡ Has been called the "father of modern chemistry"

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♡ First published his Law of Definite Proportions (or Law of Constant Composition) .
♡ Regardless of how the compound was created.

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♡ First introduced the atomic theory.
♡ Developed methods to calculate atomic weights and structures and formulated the law of partial pressures.

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♡ Discovered electromagnetic induction
♡ Repeated Oersted's experiment placing a small magnet around a current-carrying wire and verified that the force exerted by the current on the magnet was circular.

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♡ Discovered radioactivity in uranium.
♡ Made scientists radically change their ideas about atomic structure. Radioactivity demonstrated that the atom was neither indivisible nor immutable.

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♡ Discovered he electron by experimenting with a Crookes, or cathode ray, tube.
♡ Also found the first evidence that stable elements can exist as isotopes.
♡Invented the mass spectometer.

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♡ Discovered the existence of the elements radium and polonium in their research of pitchblende.
♡ In 1902, they successfully isolate radioactive radium salts from the mineral pitchblende

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♡ Discovered the quantum of action, now knwn as Planck's constant.

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♡ Mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability.

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♡ Discovered the elementary charge of an electron using the oil-drop experiment.

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♡ Discovered the nucleus of the atom
♡ The experiment showed the existence of a nuclear atom - a small, positively-charged nucleus surrounded by empty space and then a layer of electrons to form the outside of the atom.

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♡ Proposed a model of the atom in which the electron was able to occupy only certain orbits around the nucleus.
♡ This model was he first to use quantum theory.

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♡ Made a fundamental discovery in the domain of nuclear science: he proved the existence of neutrons – elementary particles devoid of any electrical charge.