2b - group 7 halogens

Question 1

what are 4 characteristics of group 7?

Answer 1

-coloured vapours
-form ionic salts with molecules
-form molecular compounds with non-metals
-7 electrons in outer shell

Question 2

what are 4 group 7 elements and their states of matter?

Answer 2

-fluorine is a pale yellow gas
-chlorine is a pale green gas
-bromine is a dark brown liquid
-iodine is a grey solid

Question 3

what are 2 changes that occur as you move down group 7?

Answer 3

• higher melting points and boiling points
  -less reactive

Question 4

what is group 7 of the periodic table called?

Answer 4

the halogens

Question 5

why is fluorine in group 7 of the periodic table?

Answer 5

because it has 7 electrons in its outer shell

Question 6

what is the colour and state of chlorine at room temp?

Answer 6

a green gas

Question 7

what happens to the melting points of the halogens going down the group?

Answer 7

it decreases

Question 8

why can’t iodine displace chlorine from potassium chloride.

Answer 8

because iodine is less reactive than chlorine

Question 9

why does chlorine have a higher melting point than fluorine?

Answer 9

because there are strong inter molecular forces which need more energy to break

Question 10

give the charge of ions when halogens react with group 1 metals.

Answer 10

1-

Question 11

what are halide ions?

Answer 11

when halogen atoms gain an electron, carrying a 1- charge