1 of 26

Slide Notes

DownloadGo Live

Sami Ponder

Published on Nov 19, 2015

No Description

PRESENTATION OUTLINE

THE EVOLUTION OF ATOMIC THEORY

BY:SAMI PONDER

DEMOCRITUS

492 B.C

"Nothing exists except Atoms and empty space." -Democritus
Photo by slinky2000

HIS ATOMIC THEORY

  • Discovered that everything is made of atoms
  • Believed that the atom was the smallest particle of matter
  • His theory is sometimes just called "big thoughts"
Photo by Leo Reynolds

Untitled Slide

ARISTOTLE

Discovered earth, wind, and fire theory in 350 B.C
Photo by maha-online

EARTH, WIND, AND FIRE THEORY

  • Provided an explanation to:
  • Falling rocks
  • Rising flame
  • Circulation of air
  • Showed to a extent how the natural world worked

DALTON

Discovered billiard ball model in 1803

DALTON

Came up with laws based on 5 theory's
Photo by Amir Kuckovic

BILLIARD BALL MODEL:

  • Atoms make up all matter
  • Atoms can't be divided,destroyed, or created
  • Atoms of the same element are identical
  • His theory stated that in chemical reach toons in atoms are neither created or destroyed

J.J THOMSON

Plum pudding model 1897

PLUMB PUDDING MODEL

PLUMB PUDDING MODEL

  • His mathematical model shows that electrons were organized in rotating rings
  • He discovered the electron
  • Describes electrons as plums surrounded in a cloud of pudding

MILLIKIN

Oil drop theory in 1908

OIL DROP THEORY

  • Measures the charge of a single electron
  • Is able to find the size along with charge of an atom
  • Millikin received a Nobel prize for this discovery

Untitled Slide

RUTHERFORD

Gold foil experiment in 1909
Photo by Claudio.Ar

Untitled Slide

Untitled Slide

Untitled Slide

GOLD FOIL EXPERIMENT

  • Positively charged electron model
  • fire the beam of alpha particles on foil and watch the location the particles landed on the screen.
  • Concluded that an atom was much more than just empty space and scattered electron
  • Also found an atom must have a positively charged center that contains most of its mass
Photo by kevin dooley

CHADWICK

Proton-neutron model in 1932

Untitled Slide

Untitled Slide

CHADWICK

  • Discovered he neutron
  • Won a Nobel prize
  • James predicted the atom would have a neutron
  • He established that atomic number is determined by the numbers of protons minus neutrons
  • He also discovered the fourth subatomic particle,the neutron.

THANK YOU!!!

--Sami Ponder
Photo by zAmb0ni