group 7 elements. Flashcards
1
Q
what are the group 7 elements and what are they known as?
A
non-metals.
halogens.
2
Q
what do the halogens consist of?
A
molecules made of pairs of atoms.
3
Q
what are the properties of halogens?
A
reactivity decreases down the group .
further down the group the higher its relative molecular mass, melting point and boiling points.
4
Q
what causes the trends:reactivity decreases down the group .
further down the group the higher its relative molecular mass, melting point and boiling points.
A
outer shell gets further away form the nucleus so is less easy to gain an electron.
5
Q
what do halogens react with and what do they produce?
A
metals.
ionic salts.
6
Q
when halogens react they gain one electron so what charge do they get?
A
(-1)
