Group 7- The Halogens

The halogens are all one electron short of having a full outer shell

HALOGEN-Seven 7- Group 1

• The elements in Group 7 of the periodic table are called the halogens
• The properties of the elements in Group 7 change gradually as you go down the group (i.e. as the atomic number increases)

Group VII Elements

PROPERTIES

Atomic Number

Colour

Physical State at room temperature

Boiling Point

Chlorine

17

Green

Gas

-34 C

Bromine

35

Red brown

liquid

59 C

Iodine

53

Dark grey

Solid

185 C

• As the atomic number of the halogens increases, the elements have a darker colour and a higher boiling point (which is why they…