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Democritus said that matter is composed of indivisible particles called atomos, this made the ground for the atomic theory timeline. -
Dalton expressed that all matter is made of indivisible atoms and that atoms of and element are the same , but atoms of a different element are different, and compounds form from mixed ratios of these atoms, with reactions repositioning them. -
JJ's Model called the plum pudding model consists of spheres of atoms with diffuse positive charge with negatively charged electrons embedded in it like plum and pudding. -
His model describes the atom as mostly empty space with a tiny, dense, positively charged center called the nucleus. The nucleus contains most of the atom's mass with light, negative electrons orbiting it, similar to planets revolving around the sun. -
This model shows an electron orbiting around the central nucleus, like how the planets orbit around the sun. -
Chadwick discovered the neutron by bombarding beryllium with alpha particles and observing the release of highly penetrating radiation. -
The Atomic Theory Timeline helps us understand the atom by explaining chemical properties and showing models that we can remember by making our own little fun models and referencing them by.