Identifying the Halogens
Which Group number do the Halogens belong to?
Group 7
What is the state of matter and colour of Chlorine at room temperature?
A pale green gas
Which is the most reactive element in the halogen group?
Fluorine
Which halogen is added to water to kill bacteria and used in swimming pools?
Chlorine
Name the first four elements in the Halogen group.
Fluorine, Chlorine, Bromine, and Iodine.
Which Halogen is a liquid at room temperature?
Bromine.
Does reactivity increase or decrease as you move down the group?
decreases as you move down the group
Which halogen is found in toothpaste to help strengthen teeth?
Fluorine
Are Halogens metals or non-metals?
Non-metals.
What is the state and color of Iodine at room temperature?
A purple-black solid.
Does reactivity increase or decrease as you move up the group?
It increases
What is Iodine used for?
to treat wounds or its found in food such as fish, dairy products and seaweed to help growth and repair.
Where are they found on the Periodic Table?
On the right-hand side.
red-brown liquid
What is the atomic number of the halogen element Astatine?
85
Why is chlorine used in swimming pools?
To sterilise the water and kill harmful bacteria.
What halogen element has an atomic number of 53?
Iodine
What happens to the colour of the elements as you go down the group?
They get darker (from pale yellow to black).
Why are halogens never found as pure elements in nature?
because they are very reactive and quickly react with other elements.
Which elements were used as chemical weapons in WW1?
Chlorine and bromine