Helium
He
Helium info
The atomic number is 2 and the mass number is 4.
The period number is 1 and the group number is 18.
The group name is the noble gasses and gas is its state of matter.
The state of the element is a non-metal.
Balloons
Helium is a very light element and when put in balloons they float.
Rocket fuel
Helium is used to cool the rocket engines once they have been launched.
Lasers
Used in lasers since it is non-reactive.
even at high temperatures it will not bond with other elements.