C2: The periodic table

• Mendeleev


  Placed elements in order of atomic weights

  Left gaps for elements with similar properties
• Group number


  Tells you number of electrons in outermost shell
• Metals are good conductors of electricity, heat and sound as they contain delocalised electrons that can move freely through the lattice structure.
• Non-metals do not conduct electricity or heat well as there is no movement of electrons between atoms to allow conduction to occur.
• • Little Nasty Kids Rub Cats Fur

  Lithium, Sodium, Potassium, Rubidium, Caesium, Francium
• Alkali metals

  • All very reactive
  • Reactivity increases down the group
  • Melting and boiling points decrease also down the group
  • Form 1+ ions
  • Reaction with water produces a metal hydroxide
  • Alkaline
• First Class Briyani India


  Fluorine, Chlorine, Bromine, Iodine,
• Halogens

  • Low melting and boiling points ( increases down the group)
  • Reactivity decreases down the group
  • A more reactive halogen will displace a less reactive one
• The noble gases have low melting and boiling points due to weak intermolecular forces between molecules
• The noble gases are unreactive because their outer shells are full so they don't need any extra electrons to fill them up