metals and non-metals

    Cards (20)

    • 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
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