topic 2 periodic table

• what number pages to revise for halogens

  10-15
• what are they in elemental form

  toxic, smelly and crumbly when solid
• colour of flourine


  green gas
• colour of chlorine


  green yellow gas
• colour of bromine


  reddish brown liquid
• iodine


  grey solid that becomes purple when gas
• astatine


  black solid
• what is it called when halogens react with certain metals

  metal halides
• give an example


  sodium chloride
• what are group ones also called

  alkali metals
• are these reactive and why

  they are because they only have one electron
• give a consequence for them being so reactive

  theyre usually metal oxides because they bond to oxygen for stablilty
• transition metals are used more in


  everyday life
• giev some trends of transition metals

  harder,

  stronger,

  higher melting points,

  often coloured compounds,

  higher densities,

  less reactive,

  good conductor of heat and electricity,

  dont vigorously react with oxygen or water
• what can they be used for

  pottery and ornaments
• do they all form the same charges

  no, they all have different charges
• they make great catalysts..,. meaning


  they increase the rate of a chemical reaction by creating a more accessible pathway requiring less energy.
• balanced equation for sodium reacting with oxygen

  4Na+O2 --> 2Na20
• balanced equation for sodium reacting with water

  2Na + H20 --> 2NaOH + H2
• balanced equation for sodium reacting with chlorine

  2Na + Cl2 --> 2NaCl
• are group 7 monotomic or diatomic

  yes, including hydrogen
• halogens happily join with what metals


  group 1 metals as their charges of 1+ and 1- are balanced
• why are transition metals used more irl

  theyre more practical and pretty. they also have relatively low reactivity
• what is a characteristic about ions in transition metals

  theyre ions with different charges
• properties of ionic compounds

  they all form crystals, high melting and boiling points, hard and brittle, conduct electricity well when dissolved in water, when solid theyre good insulators.
• how to calculate rfm

  adding the relative atomic masses.