Group 7 elements

Question 1

What are the group 7 elements called?

Answer 1

• Halogens

Question 2

Properties of halogens:

Answer 2

• Toxic
• Low boiling point
• Low melting point
• Poor conductors of heat + electricity
• Exist in diatomic molecules

Question 3

How are halogens joined together?

Answer 3

• Covalent bonding

Question 4

How do the properties of Group 7 elements change going down the group?

Answer 4

• Becomes less reactive
• Higher boiling point
• Higher melting point

Question 5

How do Group 7 elements behave when reacting?

Answer 5

• Gain ion, form -1

- Full outer shell, stable

Question 6

How do halogens react with other elements to become stable?

Answer 6

• Share electrons with non-metals

- Covalent bonding

Question 7

How do halogens react with other elements to form an ion?

Answer 7

• Bond with metals

- Form -1 ion

Question 8

What is a displacement reaction in halogens?

Answer 8

• A more reactive halogen will displace a less reactive halogen from solutions of its salts
  E.g: Cl2 + 2KBr –> 2KCl + Br2
  (Chlorine displaces Bromine)