periodic table

• element is one type of atom
• compound is made up of two or more atoms that are chemically joined
• mixture is two or more different atoms that are not chemically joined
• columns are called groups
• rows are called periods
• brittle means hard but likely to break easily
• ductile means able to be drawn out into a thin wire
• malleable means able to be hammered or pressed into shape without breaking or cracking
• density is the number of atoms in a given volume of a substance
• group 1 metals

  alkali metals
• Li

  Lithium
• Na

  Sodium
• K

  potassium
• Lithium's colour of flame

  red
• Sodium's colour of flame

  orange
• Potassium's colour of flame

  purple
• what are the properties of alkali metals

  • shiny
  • high melting point
  • good conductors of heat and electricity
  • low density
• lithium + water

  lithium hydroxide (alkali) + hydrogen(gas)
• group 7

  halogens
• metal + halogen

  metal hal(ide)
• one non-metal on the right

  add "ide"
• two non-metal but one of them on the right (that is not oxygen)

  add "ate'
• halogen's reactivity

  • fluorine
  • chlorine
  • bromine
  • iodine
  • astatine

  melting and boiling points increases
• fluorine's gas colour

  pale yellow
• chlorine's gas colour

  pale green
• bromine's liquid colour


  red-brown
• iodine's solid colour


  purple
• lithium + fluorine

  lithium fluroide
• sodium + oxygen + carbon


  sodium carbonate