4.1.2 group 0

• Group 0 elements are known as the noble gases
• Noble gases are unreactive (inert) because they have a full outer electron shell
• Noble gases do not lose or gain electrons because their outer shell is already full
• Noble gases can be used in light bulbs because they will not react with the hot metal filament
• Noble gases exist as single atoms instead of forming molecules. They are monatomic
• Noble gases have low boiling points, but their boiling points do increase as you go down the group. This is because the relative atomic mass increases lower down the periodic table
• Group 0 elements have low densities. Their densities do increase as you go down the group because of their increasing relative atomic mass. Low density makes them useful in balloons