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400
Democritus BC
He discoverd dat atoms are uncutable.
He used a experiment with salt toasted sharp method.
He believed atoms were the smallest particles of matter -
Dalton
Dalton thought matter consists of invisable atoms and that atoms are arranged in different componds.
He used a experiment that shown that matter is made of tiny particles.He imagined them as little tiny balls that arranged different.
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Thomson
Thomson discoverd electrons are much smaller than atoms.
His observation showed that with heating the postive and negative charge makes nuetral electrons.
He thought the atom looked like a plum pudding shape.
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Rutherford
He discoverd way before his project that radioactive elements give off postivley and negatively charges. Rutherford found everybody thought the shape was plum pudding while observing
He thought the object consisted of subatomic particles
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Bohr
He discoverd would spin around and orbit around the necleus.
He used thories from observations that the necleus spun around.
he thought the shape of electrons were like planets
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Heisenberg and Schrodginer
They showed electrons were files around the atom.
He used evidence from experiments.
They thought atoms orbited around the middle nucleaus called orbital
