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330
Aristotle
He was a pholosifer and he wrote the pholosiph on life, litericture, polotics, etc.
he wrote on many different topics and was a very smart man of his time -
400
Democritus
he descovered the atomic hypolthosis
he said that everything was made of atoms which are invisable and are alwasys in motion -
John Dalton
He Created the Atomic Theory
He stated the 5 main points of the theory
1.Elements are made of extremely small particles called atoms.
2.Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
3.Atoms cannot be subdivided, created, or destroyed.
4.Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
5.In chemical reactions, atoms are combined, separated, or rearra -
JJ Thomson
he discovered that the unites were 1000 times smaller that the atom he used cothode rays to discover it -
Ernest Rutherford
he reaserched on radioactivity and soon createded the "half life" of something -
Albert Einstein
he was a very smat many who invented many things but was most famous for his math skills and scientific skills -
Niels Bohr
he founded the contribulion of the atomic stucture. -
Electron Cloud Model
a positively charged nucleus, with a cloud-like collection of electrons surrounding it. The cloud represents where the electrons could be, not where they are at a given moment. This model also insists that electrons travel randomly around the nucleus without any certain pattern. -
James Chadwick
He discovered the nutron
he studyed them for many years before he presented it -
Marie Curie
she was researching on radioactivity and did'nt knoiw the effect of it and soon died from the exposure
