Atomic structure and the Periodic Table

• Element


  All of the atoms are the same
• Elements


  • Magnesium
  • Sulfur
• Symbol


  Starts with a capital letter
• Compound


  Two or more different elements chemically combined in fixed proportions
• Compounds usually have totally different properties to the elements they are made from</b>
• Mixture


  Different elements or compounds, not chemically combined
• Mixture components


  • Magnesium atoms
  • Sulfur atoms
  • Magnesium sulfide
• Physical separation techniques


  • Filtration
  • Distillation
  • Crystallization
  • Chromatography
• Molecule


  Any elements chemically combined, even if they are the same element
• Molecules


  • Methane
  • Water
  • Ammonia
  • Chlorine
  • Oxygen
• Molecules that are not compounds contain the same element chemically combined
• Molecules that are not compounds are elements