what colour is the chlorine vapour?
what colour is the bromine vapour?
what colour is the iodine vapour?
group seven metals react with alkali metals to form what? what charge does the group 7 have?
what is an ion of group 7 called?
the further down the group you go the .... the melting and boiling points
the further down the group you go the ..... reactive the element
at room temperature, what form does bromine take?
what is group 7 called?
the vapors of group 7 have what 2 properties?
what colour is the fluorine vapor?