Group 7 Elements

Question 1

What are group 7 elements known as ?

Answer 1

Group 7 elements are know as halogens

Question 2

What are halogens ?

Answer 2

The halogens are all non metals with coloured vapours
Fluorine- is a very reactive, poisonous yellow gas

Chlorine- is a fairly relative, poisonous dense green gas

Bromine- is a dense, poisonous red/brown liquid

Iodine- is a dark grey crystalline solid or a purple vapour

They all exist as molecules which are pairs of atoms

Question 3

Trends of halogens

Answer 3

Halogens are less reactive - it’s harder to gain an extra electron, because the outer shell’s further from the nucleus

They have higher melting and boiling points

They have higher relative atomic masses

Question 4

Why do they all react similarly?

Answer 4

All halogens react similarly because they are all in the same group

Question 5

What can halogens form ?

Answer 5

Halogens can form molecular compounds

Halogen atoms can share electrons via covalent bonding with other non metals so as to achieve a full outer shell

Question 6

What can halogens form from metals

Answer 6

Halogens can form ionic bonds with metals

Question 7

The more reactive a halogen what would it do to the less reactive ones ?

Answer 7

The more reactive a halogen it will displace the less reactive ones

Question 8

How does a displacement reaction occur ?

Answer 8

A displacement reaction can occur between a more reactive halogen and the salt of a less reactive one