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  • Okay class, today we are going to learn about atoms, and the development of the atomic model.
  • Okay class this is the atom, the smallest unit of matter, it's what everything is made of. The big part in the middle is the nucleus. It is made up of positive protons and neutral neutrons. The things on the outside are negative electrons. They orbit the nucleus, and the area they orbit is in the electron cloud ("an electrons home/where they stay"). But this isn't always what the atom looked like...
  • First there was Thompson's model. Using cathode rays he was able to determine there was small mass in the atom with a negative charge. So he knew it must have been an electrons. Since there was negative he knew there had to be a positive charge somewhere so his model had the negative electrons scattered in a big positive mass.
  • Then there was Rutherford's. He shot tiny particles through a piece of thin gold and most of them went through. This wouldn't happen with Thompson's model so he knew an atoms must have been mostly empty space. So his model had a big big positive nucleus and smaller electrons around it.
  • After this Chadwick found the neutron in thr nucleus. Another scientist named Bohr proposed that electrons went in circular orbits around the nucleus. Bohr's model had electrons orbiting the nucleus in a circle and the neutron in the nucleus.
  • So class why is the progression of the atom so important? It's because now today we know what everything is made of; and we can continue our research on matter and see if atoms are made up of even smaller things like quarks that scientists are researching now.. Now we have more knowledge. Technological advancements helped this achievement. The cathode ray was developed, and this helped us learn about the atom. And now we have the scanning tunneling micro scope which helped us find the accurate atomic model, and is still helping . Technology played a huge part.
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