2.4 group 7 - the halogens

Question 1

Halogens def

Answer 1

The elements that are found in group 7 of the periodic table

Question 2

What are the halogens?

Answer 2

A group of toxic non-metals that have coloured vapours

Question 3

What are the physical properties of halogens?

Answer 3

• low melting and boiling points
• poor conductors of heat and electricity

Question 4

Do the melting and boiling points increase or decrease going down the group?

Answer 4

Increase

Question 5

How do halogens exist as elements

Answer 5

As molecules made up of pairs of atoms, called diatomic molecules. The atoms in each pair are joined to each other by a covalent bond

Question 6

Do halogens lose or gain electrons when they react?

Answer 6

They gain one electron to achieve the stable electronic structure of a noble gas

Question 7

What happens when halogens react with other non-metals?

Answer 7

They gain an extra electron by sharing a pair of electrons with another atom

Question 8

Do halogens get more or less reactive going down the group

Answer 8

Less

Question 9

How do halogens react with metals?

Answer 9

They gain a single electron to five them a stable arrangement of electrons and form ions with a 1- charge (ionic compounds)

Question 10

How can you test to check the reactivity of halogens?

Answer 10

Using the following rule:
A more reactive halogen will displace a less reactive halogen from solutions of its salts