Atomic Structure

• Compound:

  2 or more elements that are chemically bonded
• Mixture:

  2 or more substances that are not chemically bonded
• Atoms:

  • contain subatomic particles (protons, neutrons and electrons)
• Strcuture of the atom:

  A) electron

  B) proton

  C) neutron

  
• Nuclear Model:

  • Rutherford conducted an experiment to test the Plum Pudding Model
  • Positively charged particles were fired at thin gold foil
  • some scattered in different directions and most went through the foil
  • proved there is empty space in an atom
• Rutherford suggested that the atom had a positively charged nucleus.
• Atomic Mass: number of protons + neutrons

  Atomic Number: number of protons

  A) Atomic Mass

  B) Element Symbol

  C) Atomic Number

  
• Number of protons and electrons are the same
• Ions: atoms that have gained or lost electrons, so have a different number of electrons than the atom has protons
• Electron Arrangement:

  • gives us info. about atom's reactivity
  • position of element on periodic table gives us info. about position of shells