C4.1.2 - Halogens

Question 1

Where are the elements in Group 7 placed on the Periodic Table?

Answer 1

In a vertical column on the right side of the Periodic Table

Question 2

Describe the properties of the halogens.

Answer 2

Brittle

Poor conductors of electricity

Question 3

Describe the trends of the halogens.

Answer 3

Density increases as you go down
Melting and boiling points increase as you go down
Reactivity decreases as you go down

Question 4

How strong are the intermolecular forces in halogens?

Answer 4

Weak

Question 5

What type of molecules are Group 7 elements made of?

Answer 5

Diatomic

Question 6

Describe a halogen

Answer 6

Diatomic molecules held together by weak intermolecular forces

Question 7

Name the colours of the halogens.

Answer 7

Fluorine - yellow
Chlorine - green
Bromine - orange/brown
Iodine - purple

Question 8

What do halogens create when reacting with metals?

Answer 8

Salts

Question 9

How vigorously do halogens react with alkali metals?

Answer 9

Very vigorously

Question 10

Why do halogens have similar chemical properties?

Answer 10

They all have 7 electrons in the outer shell

Question 11

How many electrons do halogens gain or lose in reactions?

Answer 11

Gain 1 electron to complete outer shell and create a negatively charged ion

Question 12

Name all of the halogens.

Answer 12

Helium, fluorine, neon, chlorine, argon, bromine, krypton, iodine, xenon, astatine, radon

Question 13

Write the general ionic equation modelling the change in a halogen.
(X standing for the symbol of the halogen)

Answer 13

X2 + 2e- —> 2X-