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Discovery of the Atomic Theory

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by Susmera Cholayil on 11 September 2012

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Transcript of Discovery of the Atomic Theory

The "uncuttable" piece
Particles (Indivisible in Greek)
Atoms- small hard particles
one substance and one shape
moving and combined DEMOCRITUS The History of the Atomic Theory ARISTOTLE ROBERT BOYLE ANTOINE LAVOISIER JOHN DALTON J.J. THOMSON HANTARO NAGOAKA ERNEST RUTHERFORD NIELS BOHR QUANTUM MECHANICAL MODEL 440 BC Didn't think atoms would move
If they were in a void
four elements and four qualities
align in the right place
rest 340 BC First scientist to perform experiments using apparatus, procedure and observations.
BOYLE'S LAW
If the volume increased, the pressure increased
invented the idea of the element
first scientist to publish work 1650 1765 Father of modern chemistry
Law of Conservation of mass
Mass neither created or destroyed during chemical or physical reactions
He burnt phosphorus and sulfur in the air, and proved that the products weighed more than the beginning.
Weight gained was air 1st one to suggest that this fundamental
unit was 1000 times smaller than the atom
'Corpuscles' --> later named electrons
Composition of canal rays
Radio activity of potassium
Said the atom was round with electrons scattered inside
The Plum Pudding Theory Did you know?! Lavoisier's first live experiment was to light the streets of Paris! Other contributions to chemistry was the consistent use of chemical balance, use of oxygen to overthrow the phlogiston theory, and developing a new system of chemical nomenclature. DID YOU KNOW?! Aristotle was guided by Plato, and mentored Alexander the Great! Did you Know?! He lived for over a hundred years,
and in order to make himself fulfill his intellectual abilities, he blinded himself with burning glass. DID YOU KNOW?! He went to Eton College in London at the mere age of 8, and later formed the Invisible college consisting of geniuses who devoted their lives to create a new philosophy! ORIGINAL THEORY - atoms could be distinguished based on their weight.

This theory led to :-
All matter is composed of atoms
Atoms cannot be made or destroyed
All atoms of the same element are identical
Different elements have different types of atoms
Chemical reactions occur when atoms are rearranged
Compounds are formed from atoms of the constituent elements. 1803 DID YOU KNOW?! Dalton was the first to describe color blindness.
He also started teaching at the age of 12, but majored in English, not in Science DID YOU KNOW? He won the Nobel Prize for physics in 1908 for the discovery of electrons Discovered that the atom was sphere shaped
Did not agree with J.J Thomson's model
Suggested saturn like model for atom
Did research in spectroscopy
Published a paper on the inductance of solenoids DID YOU KNOW? He was the first Japanese physicist Discovered the concept of radio-active half life
Credited with "splitting of the atom"
Performed the gold foil experiment
Ruherford's model of atoms was a very small positively charged nucleus DID YOU KNOW? He became known as the father of nuclear physics Made foundational contributions to understanding atomic structure and quantum mechanics
He worked in a top secret Los Alamos lab in New Mexico on the Manhattan Project
Helped investigate the structure of atoms DID YOU KNOW? He was an Olympic footballer who played in the Danish national team and won a nobel prize for physics By Chaitra Subramaniam and Susmera Cholayil HIGGS BOSON
2012 God's particle
Atoms supposedly made of protons, neutrons, and electrons
mass
scientists added the three together
still space left Standard Model of physics
- Identify weak nuclear force
- explain why other particles have mass at all
- Satyendra Nath Bose and Peter Higgs were the founders Explains the behavior of particles in the atomic and subatomic realms
It is important because it correctly defines the electrons movement with relation to the nucleus
Constructed by Erwin Schrödinger
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