topic 1b - the periodic table (5. group 7 - the halogens)

Question 1

properties of halogens?

Answer 1

exist as molecules that are pairs of atoms. 
coloured vapours - 
F - yellow gas
Cl - green gas
Br - orange gas
I - purple gas

Question 2

reactivity of halogens

Answer 2

reactivity decreases as you move down

Question 3

melting and boiling points of halogens

Answer 3

increase as you go down the group

Question 4

halogens reacting with non-metals

Answer 4

halogen atoms can share electrons via covalent bondings. the compounds that form have simple molecular bonds

Question 4

halogens reacting with non-metals

Answer 4

halogen atoms can share electrons via covalent bondings. the compounds that form have simple molecular bonds

Question 5

halogens reacting with metals

Answer 5

ionic compounds are formed. halogens gain 1 electron so they have a -1 ionic charge. known as halide ions.

Question 6

what happens in displacement reactions

Answer 6

if an element is more reactive then it will displace the less reactive element from the aqueous solution.