Group 7 halogens Flashcards
What are the typical characteristics of group 7 halogens?
Because they are non-metals they are usually brittle and are poor conductors of electricity.
What do the elements exist as?
Diatomic molecules except for astatine and Tennessine whereas the rest are diatomic molecules with weak intermolecular forces.
What are their states at room temperature?
Fluorine- pale yellow gas
Chlorine- green gas
bromine-orange brown liquid that evaporates quickly.
iodine- shiny grey-black crystalline solid that sublimes into purple vapour.
why does the melting and boiling point increase as you go down the group?
1) molecules get bigger
2) intermolecular forces get bigger
3) more energy is needed to overcome these forces
what happens to the density as you go down the group?
It increases
does it get more reactive or less reactive down the group?
less reactive
why have they named group 7 halogens?
As when they react with metals they form salts.
why does get unreactive down the group?
As the number of shells increases meaning that the electrons are less reacted to the nucleus.
what is the general equation to show the gaining of electrons by the group 7 halogens?
Write it down
what happens when group 7 elements react with non-metals?
They form covalent bonds.
What happens when group 7 elements react with metals?
They form ionic compounds and the group 7 elements gain one electron from the metals completing their outer shells. While doing that they become 1 minus ions.
