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 found in toothpaste to help strengthen teeth?
Fluorine
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
Which halogen is added to water to kill bacteria and make it safe to drink?
Chlorine
Are Halogens metals or non-metals?
Non-metals.
What is the state and color of Iodine at room temperature?
A purple-black solid.
Why are halogens never found as pure elements?
Because they are very reactive and quickly form compounds with other elements
What is iodine used for in a hospital setting?
As an antiseptic and used to treat wounds.
Where are they found on the Periodic Table?
On the right-hand side.
What state of matter and colour is bromine?
red-brown liquid
If you move from Iodine to Bromine does the reactivity increase or decrease?
increases
Why is chlorine used in swimming pools?
To kill bacteria/ microbes
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).
Does reactivity increase or decrease as you move up the group?
increases
What elements were used in WW1?
Chlorine and Bromine