metals and non-metals

• how is it organised now

  in increasing atomic number
• why do the groups of elements have similar reactivity

  because they've all got the same number of outermost electrons
• What charge does a group 1 ion have?

  x+ when x is the element
• Metals form positive ions because;...

  they want to lose electrons to form a full outer shell.
• Non-metals form negative ions becuase...


  they want to gain electrons to form a full outer shell
• the right side is...

  non-metals
• the left side is

  metals
• Most metal oxides...


  are basic (pH of 8 or above)
• Most non-metal oxides are...

  acidic (pH of 6 or below)
• Are the boiling/melting points of metals high or low

  high
• Are the boiling/melting points of non-metals high or low

  low
• give some properties of metals

  good conductors of heat and electricity, shiny, ductile, high density, malleable.
• give some properties of non metals

  bad conductors of heat and electricity, dull, low density, brittle.
• noble gases described


  Noble gases are un-reactive and do not easily form molecules because their atoms have stable arrangements of electrons (full outer shells)
• they exist as single or more than one atom

  single (inert)
• how were they shown in mendeleevs table

  they werent because they hadnt been discovered
• what was first to be discovered and what did it cause

  helium and because it was stable it didnt have similarities with other groups so it started a new group
• trends in group 0


  the boiling point, density and RAM increases down the group. the atoms get larger meaning the intermolecular forces get stronger and require more energy to overcome.
• key facts


  noble gases are colourless unless excited

  they are able to react but it is very rare
• group 0 is also known as

  the noble gases