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400 BCE
Democritus' Theory
Democritus' theory recorded that everything on Earth are made out from atom. He also noted that atoms are cannot be created nor destroyed. He said that atoms are always moving around in space between atoms. He said that there are limit numbers of atoms on Earth. -
John Dalton's theory
John Dalton stated that every element on Earth are made out of atom, which all atoms from every different element has the same amount of mass and properties. He also noted that the combination of two atoms are named 'compounds'. -
J.J. Thompson's discovery
His experiment from the Cathode Ray Tube Experiment discovered that there are positive and negative charged particles in an atom. The cathode ray from his experiment had negatively charged particles, which on the other hand, the neon gas from his experiment had positively charged particles. -
Ernest Rutherford's discovery
His research and his experiment shows him where the the atom's density is located. Ernest's experiment shows the impacts of the alpha radiation and the beta radiation. His experiment concludes that the nucleus carries the most mass in in the atom and it is positively charged. -
Neils Bohr's creation of an atom model
Neils' atom model is to replenish Rutherford's model as he did not explain the properties of an electron and the explanation of why atoms give out light sometimes and sometimes it doesn't. His theory is to complement Rutherford's theory and explained quantum jump from orbit to other orbit and explained why light will discharge.Neil's theory is a better version of Rutherford's one -
Erwin Schrodinger's prediction
Erwin stated that the odds of an electron will be placed in a specific place in an atom, but not orbiting the nucleus randomly around it, as Erwin found out that Niels' atom model was not accurate as his.
