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Aug 3, 1492
Christopher Columbus Sets Sail From Spain
Columbus Sailed The Ocean Blue -
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Revolutionary War
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Dalton's Model
John Dalton was the first person to describe atoms. He developed the Atomic Theory. There are 4 main points of Dalton's Atomic Theory. He states that all matter is made of atoms, all atoms of a given element are identical in mass and properties, compounds are formed by a combination of two or more different kinds of atoms, and a chemical reaction is a rearrangement of atoms. Daltons theory became one of the foundations of chemistry. -
Period: to
Max Planck
Max Planck discovered a substantial component in understanding the laws of quantum physics. Prior to Planck, modern believe was that energy such as light, heat, and radiation was a continuous flow from one source to its’ receiver. Around 1900, Planck wrote a paper on The Theory Of The Law Of Energy Distribution In The Continuous Spectrum, showing that energy was actually tiny, discontinuous units. Planck’s paper helped scientists better understand atomic and subatomic energy. -
Thompson's Model
Thomson’s Model provided us with the first hint that atoms were divisible. Thomson studied gas and electric currents and found that gas gives off negatively charged particles and called them “corpuscles” which are now known as electrons. He discovered the an atom had a neutral charge so there had to be a particle that had a positive charge. He was not ever able to discover what is known today as the “proton”. His model was called the Plum Pudding Model and developed in 1904. -
Rutherford Model
Rutherford Model shows that most of the mass in an atom is in the nucleus. Also that most of the space around the nucleus is just empty space. This model helped scientists understand that the atom is not just one particle, but it’s made up of smaller subatomic particles. Scientists also discovered that an atom’s nucleus is positively charged because of the Rutherford Model. Rutherford made his model to disprove Thomson's Model. -
Bohr Model
The Bohr Model has an atom made up of a small, positively-charged nucleus. The nucleus is surrounded by orbiting negatively charged electrons. The Bohr Model suggested that the outer shell of electrons can hold the most amount of electrons. Because of the Bohr model other physicists expanded the theory into the quantum mechanics. -
Schrodinger Model
The Schrodinger Model says that the electrons are waves. It also tries to describe what region or place electrons can be found in. Currently it only tells scientists where it might be found instead of where it is. A huge advantage of this model is that it uses mathematical equations which are called wave functions. -
Quantum Mechanical Model
The Quantum Model is based on Mathematics and Quantum Theory. It is very difficult to understand, but it is very useful for explaining complex atoms. Contrary to Schrodinger's Model, this model says that it is impossible for anyone to know where the exact location of an electron is at any given moment. This is known as the Uncertainty Theorem. -
Chadwick Model
The Chadwick atomic model is basically the same model as Bohr's, with the nucleus containing the protons, neutrons and orbitted by the negatively charged electrons. Chadwick was the one who discovered the neutron part of the atom which has no charge but has the same mass as a proton -
Murray Gell-Mann & George Zweig Model
These two men’s model showed that there were different very important properties of particles such as Baryons. They showed this by treating the particles as triplets of other constituent particles. They both were amazing scientists who won Nobel Prizes. Due to their innovation, other scientists could take it one step closer to understanding the atom. -
Greek Model
In 492 BCE, the Greek Philosopher Democritus developed the greek model more than 2400 years ago. The Greek model of the atom is a simple one: take anything you like, break it down in smaller and smaller amounts and then you'll arrive at the "most fundamental unit" of that particular thing, whatever it is. That is the atom. The word atom was derived from the greek word “atomos” meaning “indivisible.” This theory was on the right track but was not taken seriously and later forgotten. -
Fall Of The Mayan Empire
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