Democritus: Enrico Fermi Planetary Model
Democritus
Democritus believed that there were four properties of atoms:
Atoms are small hard particles,
Made of a single material formed into different shapes and sizes,
They are always moving, and they form different materials by joining together.
In 425 BC, Democritus was suggesting ideas that were hundreds of years ahead of him. He suggested that everything was made up of atoms. He suggested that atoms were small hard particles, were a single material formed into different shapes and sizes, they are always moving and they join together to form different materials. But due to no real proof he was considered a fool and that he was crazy.
Aristotle
Aristotle believed that there were five different types of elements:
Earth,
Wind, …show more content…
Fire,
Water,
And Ether.
He said that these elements make up all substances and that they move to the center of the universe. He also did not follow the teachings of Democritus. So many people believed Aristotle that it became the more popular theory.
John Dalton
Dalton performed experiments on how elements join to create new substances. he proposed four different ideas about atoms. All substances are made up of atoms which are small particles that cannot be created, divided, or destroyed. Atoms of the same element are exactly alike and atoms of different elements are different. Atoms join with other atoms to form different substances. In chemical reactions, atoms are combined, separated, or rearranged.
William Crookes
Crookes invented a tube in 1855 that let him see many things that scientists previously couldn’t. The glass sealed tube had two electrons connected to the battery. This invention let Crookes see a pathway to where electrons traveled. This was another step closer to understanding atoms and electrons.
Mendeleev
Mendeleev was the first to create the beginning of the modern Periodic Table. In 1869, Mendeleev became a professor. He had no text books for his classes, so he wrote his own. He created a way to group the elements by their atomic mass. This was the Periodic Table.
Thomson
In 1897, J.J. Thomson began experimenting with the Crookes tube. In his experiments he held a magnet up to the side of the tube, he tried to direct the beam of light in the tube. As a result, he discovered that the light was a negative charge if it was attracted to the positive charges. Because of this discovery, these negatives were soon called electrons.
James Chadwick - 1932
Chadwick discovered neutrons in the nucleus in the atom using experiments developed by Irène Joliot-Curie. He also recreated the model of an atom, displaying it as a cloud, nudging out the design that looked like a bunch of rings by Niels Bohr a decade earlier.
Ernest Rutherford- 1911
Ernest Rutherford was a young promising student of J.J. Thomson who followed up on Thompson's previous discoveries. He expected the results that his teacher expected but instead he found out that an atom has a dense center, also know as a nucleus, empty space makes up most of the atom and the nucleus has a way larger mass than an electron
Niels Bohr-1913
Up until this time the movement of electrons had not been studied.
But Niels Bohr looked into this and found out that electrons move in paths around the nucleus. Surprisingly these electron can move from one path to another. They can also jump to a path that is a level above. Bohr created a model called the planetary model. This model shows how the electron move in different energy levels.
Enrico Fermi -- 1940
Enrico Fermi was the very first person to create a nuclear reactor, a device used to control nuclear chain reactions. It is mostly used today to generate electricity at nuclear power plants, but they have many other uses
Werner Heisenberg-1926
Werner Heisenberg worked right around the time of James Chadwick. He discovered that neutrons, electrons and protons do not have a direct connection. His discoveries introduced atomic physics. He found out that the number of neutrons are not always the same. One thing led to another and the discoveries of Heisenberg helped to create the nuclear bomb.
Henry Moseley
Henry Moseley’s findings allowed for a more accurate placement for elements on the periodic table. He used x-ray spectra to study atomic structures to do this. Because of Mosley's discoveries, the periodic table is ordered by an element's atomic
number.
Marie curie
Marie Curie was a Polish-French physicist and chemist who was inspired by the work of Henri Becquerel, a French physicist who discovered that uranium casts off rays
Democritus believed that there were four properties of atoms:
Atoms are small hard particles,
Made of a single material formed into different shapes and sizes,
They are always moving, and they form different materials by joining together.
In 425 BC, Democritus was suggesting ideas that were hundreds of years ahead of him. He suggested that everything was made up of atoms. He suggested that atoms were small hard particles, were a single material formed into different shapes and sizes, they are always moving and they join together to form different materials. But due to no real proof he was considered a fool and that he was crazy.
Aristotle
Aristotle believed that there were five different types of elements:
Earth,
Wind, …show more content…
Fire,
Water,
And Ether.
He said that these elements make up all substances and that they move to the center of the universe. He also did not follow the teachings of Democritus. So many people believed Aristotle that it became the more popular theory.
John Dalton
Dalton performed experiments on how elements join to create new substances. he proposed four different ideas about atoms. All substances are made up of atoms which are small particles that cannot be created, divided, or destroyed. Atoms of the same element are exactly alike and atoms of different elements are different. Atoms join with other atoms to form different substances. In chemical reactions, atoms are combined, separated, or rearranged.
William Crookes
Crookes invented a tube in 1855 that let him see many things that scientists previously couldn’t. The glass sealed tube had two electrons connected to the battery. This invention let Crookes see a pathway to where electrons traveled. This was another step closer to understanding atoms and electrons.
Mendeleev
Mendeleev was the first to create the beginning of the modern Periodic Table. In 1869, Mendeleev became a professor. He had no text books for his classes, so he wrote his own. He created a way to group the elements by their atomic mass. This was the Periodic Table.
Thomson
In 1897, J.J. Thomson began experimenting with the Crookes tube. In his experiments he held a magnet up to the side of the tube, he tried to direct the beam of light in the tube. As a result, he discovered that the light was a negative charge if it was attracted to the positive charges. Because of this discovery, these negatives were soon called electrons.
James Chadwick - 1932
Chadwick discovered neutrons in the nucleus in the atom using experiments developed by Irène Joliot-Curie. He also recreated the model of an atom, displaying it as a cloud, nudging out the design that looked like a bunch of rings by Niels Bohr a decade earlier.
Ernest Rutherford- 1911
Ernest Rutherford was a young promising student of J.J. Thomson who followed up on Thompson's previous discoveries. He expected the results that his teacher expected but instead he found out that an atom has a dense center, also know as a nucleus, empty space makes up most of the atom and the nucleus has a way larger mass than an electron
Niels Bohr-1913
Up until this time the movement of electrons had not been studied.
But Niels Bohr looked into this and found out that electrons move in paths around the nucleus. Surprisingly these electron can move from one path to another. They can also jump to a path that is a level above. Bohr created a model called the planetary model. This model shows how the electron move in different energy levels.
Enrico Fermi -- 1940
Enrico Fermi was the very first person to create a nuclear reactor, a device used to control nuclear chain reactions. It is mostly used today to generate electricity at nuclear power plants, but they have many other uses
Werner Heisenberg-1926
Werner Heisenberg worked right around the time of James Chadwick. He discovered that neutrons, electrons and protons do not have a direct connection. His discoveries introduced atomic physics. He found out that the number of neutrons are not always the same. One thing led to another and the discoveries of Heisenberg helped to create the nuclear bomb.
Henry Moseley
Henry Moseley’s findings allowed for a more accurate placement for elements on the periodic table. He used x-ray spectra to study atomic structures to do this. Because of Mosley's discoveries, the periodic table is ordered by an element's atomic
number.
Marie curie
Marie Curie was a Polish-French physicist and chemist who was inspired by the work of Henri Becquerel, a French physicist who discovered that uranium casts off rays