Intro to Atoms
Published on Nov 21, 2015
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PRESENTATION OUTLINE
THE ATOM
Photo by kevin dooley
DEMOCRITUS FELT THAT PARTICLES THAT COULD NO LONGER BE DIVIDED
IN HALF, WOULD RESULT IN A SMALL PARTICLE THAT HE COINED THE "ATOM".
Photo by Ian W Scott
Atom- the smallest particle into which an element can be divided & still be the same substance.
Photo by TonZ
Dalton's Atomic Theory
1. All substances are made of atoms.
2. Atoms of the same element are exactly alike.
3. Atoms join with other atoms to make new substances.
Photo by summonedbyfells
Thomson's Discovery of the Electron
-In 1897, Thomson discovered a mistake in Dalton's theory when he discovered that there are small particles within the nucleus.
Photo by Pink Sherbet Photography
RUTHERFORD, WHO WAS A STUDENT OF THOMSON'S,
DEVELOPED THE "GOLD FOIL" EXPERIMENT THAT PROVED ELECTRONS EXIST.
NUCLEUS
AN ATOM'S CENTRAL REGION THAT CONTAINS PROTONS & NEUTRONS
Photo by Argonne National Laboratory
Bohr's Electron Levels:
1. Proposed that electrons move around in a specific paths, or energy levels.
2. Electrons can move/jump from level to level.
3. There are no paths between the levels.
Photo by Bradley Wind
ELECTRON CLOUD
REGION AROUND THE NUCLEUS OF AN ATOM WHERE ELECTRONS ARE
Photo by NASA's Marshall Space Flight Center
ATOMIC MASS UNIT (AMU)
SI UNIT USED TO EXPRESS THE MASSES OF PARTICLES IN ATOMS
Photo by Robotconscience
NEUTRONS
PARTICLES IN THE NUCLEUS THAT HAVE NO ELECTRICAL CHARGE
Photo by NASA's Marshall Space Flight Center
FORCES IN THE ATOM:
- Gravitational force
- Electromagnetic force
- Strong force
- Weak force
Photo by Hammonton Photography
