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The History of the Atom Model

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Jennifer Chiang

on 7 February 2018

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Transcript of The History of the Atom Model

The History of the Atom Model
The Stone Age Chemists
Democritus
Robert Boyle
~ In the late 1660s Robert experimented with gases.
~He was interested in what happened when they were placed under pressure.
~ He was convinced that matter was
made up of really tiny particles just like Democritus theorized.
~ Boyle was also interested in determining the composition of gases and of other substances.
~ He thought that the purpose of chemistry was to determine the different types of particles in different substances.

John Dalton
1808- Proposed the bowling ball model
Today's Modern Theory
Stable Electrons
Iron Age
Antoine Lavasier
JJ Thomson
Ernest Rutherford
Niels Bohr
Erwin Shrodinger
Pounded materials into small particles and called them "Atoma" which meant "indivisible".
460 BC- Proposed the existence of the Atom
His theory was that all atoms:
Were small hard particles.

Are made of a single material formed into different shapes and sizes.
Always move.
Form different materials by joining/bonding together.
Elements combined in specific proportions to create compounds
His theory:
All substances are made of atoms that cannot be created divided or destroyed
Atoms join with other atoms to make new substances
Atoms of one element are exactly alike
Atoms of different elements vary/different in mass and size
1913- Proposed the Planetary Model, Discovered Energy Levels and Received the Nobel Prize
His theory :
Electrons travel around the nucleus in definite paths and fixed distances
Electrons can jump from one level to a path in another level
James Chadwick
Electrons = Protons
Quantum Mechanics Model
~The first chemists lived in the middle east before 8000 BC.
~ They learned how to start fires and control them too. Once they learned how to do this they learned how to change the range of substances.
~This is known as the Stone Age because humans only used simple tools at that time and metals were not yet discovered.

~In 1897 the English chemist and physicist discovered the first
subatomic
particles (particles smaller than an atom).
His theory:
~ That atoms contained
negatively charged particles that were called electrons and positively charged matter.
~ An Austrian physicist who developed the electron cloud model in 1924.
~His theory:
~

The path of electrons cannot be predicted.
~ The region referred to as the electron cloud, it is an area where electrons can likely be found.
~ He created a model that would describe the atom as a sphere that was
filled with positive matter with negative particles that were mixed in
. This was referred to as the
plum pudding or raisin bun model.
~The negatively charged electrons orbited around the charge just like the planets orbiting around the sun.
8000 BC - The First Chemists
1897 - Discovered the First Subatomic Particles
Created the Raisin Bun/Plum Pudding Model
Around the time 1200 B.C, a group of people in the middle east called the Hittites found out how to extract iron from rocks and to turn it to other useful materials.
They started combining iron with carbon to make steel.
In the 1770's he studied chemical interactions and started to developed a naming system for chemicals.
He also defined substances like hydrogen, oxygen, and carbon.
Most people call him the Father of
Modern Chemistry.
His theory:
Ernest Rutherford was a New Zealand physicist who
discovered nucleus.
James Chadwick was an English physicist who
discovered neutrons
His Theory was that Neutrons:
Have
no electrical change
Have a
mass nearly equal to the mass of a proton
1200 B.C
1700- Created a Naming System for Chemicals
1912- Discovered the Nucleus
That there were small, dense,
positively charged particles called Protons inside the nucleus
Electrons travel around the nucleus
Nucleus model proposed by Ernest Rutherford
1932- Discovered Neutrons
Although we still use Bohr's model for the atom, today's scientists have discovered that the nucleus is surrounded by a cloud of electrons.
By Megan, Selena, Jennifer
Full transcript