The Atom Model Timeline

Buddha has proposed the existence of kalapas. Kalalapas are invisible particles which may have been the first time someone ever mentioned something like this. Each particle vibrates trillions of times in a blink of an eye. This was the start of a new important part of science that we still use today.

Robert Brown noticed small grains of pollen in still water. Then it was found years later by Einstein that those grains moved because of the water particles pushing the pollen. Knwoing this, this was more proof for the scientists today to figure out thatparticles could also be in many other objects.

George Stoney used the idea of atoms of mass to propose the existence of an electrical charge which he called the electron. He said that an electron had no mass in it. Today we use electrons to figure out how we can combine molecules for example.

Eugen Goldstein found out that cathode rays were always emitted perpendicularly to its surface. This supported the fact of the particle theory electromagnetics radiation was sent in every single direction. Like a light bulb. Today we know that when a light switch is used to turn on a light, lots of electromagnetics spread out the glassware and in return we have light.

Wilhelm Roentgen produced an x-ray from a Crookes tube and Crookes himself believed that electrically charged atoms were represented as waves. Some thought that they were a new kind of electromagnetics. For example, the sun, those waves of radiation fall down on the earth which nobody has ever known before. Until today where our research has advanced to extend where we know where this electromagnetics comes from. Most likely called UV lights.

J.J. Thomson's third experiment on Cathode rays was that he measured the ratio of mass to charge cathode rays. Cathode rays we're either very light or massive amounts of charge. Cathode rays are used today to make televisions show us animations or the news. It was also greatly needed back in the days and a new way to have fun.

Hantaro Nagaoka proposed a model for the atom, he proposed to make it look like Saturn's ring. It was shown to look like a nucleus for Saturn and electrons around as the ring. When looking at the valence shells, we see the nucleus in the middle which would be shown as Saturn, and the electrons around the nucleus full of protons and neutrons was like Saturn's ring.

Robert A. Millikan won the Nobel Prize for measuring the charge on an electron. He published a paper on Plank's constant. Which he then used to prove Albert Einstein's photoelectric equation. After that, he received the Nobel Prize 7 years later.

Marie Curie and Pierre Curie discovered new radioactive elements Polonium and Radium which were discovered in "pitch blend ores". Her husband abanded his own research to help her assist on this one. It all turned out well as both of them were eager to show the world. Thus they were jointly awarded the Davy Medal in 1903.

John Dalton observed that water could turn into a liquid, solid and a gas. This was because of the particles compositions. Today we now know how the particles react when they are put in certain conditions. For example when water becomes a solid (ice) the particles because close to each other.

Democritus was a Greek philosopher that lived for 90 years. He discovered that atoms we're small particles inside objects to give them their form. He did this by cutting stone in half, both halves still had the same properties And that's when he discovered that if we cut objects as small as possible, we will get to the atoms.

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