By: Tyler Alexander

1
Structure of Atoms Electrons

• By Tyler Alexander
• Courtney Harris
• Jenifer Waites

2
Electrons, Protons Neutrons

• Electrons- negatively charged subatomic
  particles.
• Protons- positively charged subatomic particle.
• Neutrons- subatomic particles with no charge, but
  their mass equals a proton.

3
Properties of Subatomic Particles
4
Mass Number

• The total number of protons and neutrons in the
  nucleus.
• Number of neutrons mass number atomic number

5
Democritus

• Atoms were invisible, indestructible, fundamental
  units of matter

6
Dalton

• All elements are composed of indivisible
  particles called atoms.
• Atoms of same element are identical.
• Atoms of different elements can mix together to
  form compounds.
• Chemical reactions occur when atoms are
  separated, joined, or rearranged.

7
Thomson

• Discovered the electron and attempted to
  incorporate into the structure of the atom

8
Rutherford

• Proved that the Thomson atom was incorrect.
• Discovered the protons and the neutrons in the
  nucleus.
• Atom is made up of central charge, nucleus,
  surrounded by cloud of orbiting electrons.
• Alpha particles were allowed to pass through a
  thin piece of gold foil, then detected.
  Rutherford predicted that all of the particles
  would pass through the foil, or be deflected
  slightly.

9
Electron Configurations