atoms
Storyboard Text
- Atoms
- And that is all on how to tame and elephant, now we will turn it over to our newest segment, Atom who?
- Well, we are talking about DEMOCRITUS!! He was a philosopher in ancient greece around 460 BC. He believed the smallest possible piece of matter, could NOT be divided.
- Welcome to the newest segment i'm your host tutucaca! And we are going to start with someone as old as the bones behind me!!
- Who it it!
- Aristotle, man was this guy a train wreck, his theory caused death in the field of chemistry for 2000 years! He believed that all mater was made of only four elements, water, fire, earth, and air and that they each had a property.
- FINALLY, in the early 1800's John Dalton theorized that all matter is made of atoms that are to small to see. He also said that all atoms of a given element are exactly alike and atoms of a different element are different.
- Who was the scientist that had a model that looked like a chocolate chip cookie? Oh and after you finish, go fetch me a chocolate chip cookie.
- Well that would be J.J Thompson. In 1897, He provided the first hint that an Atom is made of even smaller particles. He discovered the presence of electrons and proposed that positively charged substances and negatively charged electrons were all scattered about in the center of an atom.
- After J.J Thompson, came Rutherford, in 1908, who concluded that they are not all in the center, but that Atoms have a small, dense, positively charged center called a Nucleus. He also theorized that the negatively-charged particles are scattered outside the nucleus at a distance.
- Bohr came along though, in 1913, and concluded that the mass of an atom is contained mostly in the Nucleus. He also said that instead of the electrons being scattered outside of the nucleus, they are in definite orbits around the nucleus. Kinda like planets orbiting the sun.
- Later it was found that electrons don't move in definite orbits but instead move at high speed in electron clouds outside of the nucleus. They also found that an electron location within a cloud depends on how much energy it has. This theory has been improved more throughout the 20th century.
- That's a wrap!!
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