Halogen - Seven Letters - Group 7

Question 1

What are halogens?

Answer 1

The elements in group 7

Question 2

What happens to the properties of the elements in group 7 as you go down the group?

Answer 2

Gradually change

Question 3

Properties of chlorine?

Answer 3

Atomic number: 17
Colour: green
Physical state at room temp: gas
Boiling point: -34 °C

Question 4

Properties of bromine?

Answer 4

Atomic number: 35
Colour: red-brown
Physical state at room temp: liquid
Boiling point: 59 °C

Question 5

Properties of iodine?

Answer 5

Atomic number: 53
Colour: dark grey
Physical state at room temp: solid
Boiling point: 185 °C

Question 6

As the atomic number of the halogens increases…

Answer 6

The elements have a darker colour and a higher boiling point

Question 7

The higher up group 7 an element is, the more reactive it is - why?

Answer 7

Because the shell with the missing electron is nearer to the nucleus, so the pull from the positive nucleus is greater

Question 8

What might you need to use these trends to predict?

Answer 8

The properties of other halogens e.g fluorine