halogens

• what is group 7 also known as

  the halogens (salt formers)
• are they reactive, and whats it signiicance

  yes and that means they cant live as a single atom as theyre so reactive
• they want to gain an electron by...

  reacting with a metal for a full outeer shell
• what ones are gases at room temperature

  florine and chlorine
• whats a liquid at room temperature

  bromine
• iodine is what at room temperature


  a solid
• general properties


  toxic and smelly, crumbly when solid,bromine and iodine become gases easily meaning they are volatile, darker in colour as you move down the group
• what type of experiment do we use to test the reactivity of the elements

  displacement reaction
• what happens


  you combine a halogen salt with a holgen water and see which one prevails. we use chlorine, bromine and iodine.
• give some facts about reactivity in group 7

  reactivity decreases down the group.
• when outer electrons are further from the nucleus, what does this mean

  theres more electron shielding and therefore less attraction from outer negative electrons and positive nucleus, and its harder for the atom to gain an electron.