Argon

Element Symbol: Ar
Atomic Number​: 18
Atomic Mass: 40
Protons: 18
Electrons: 18
Neutrons: 22
Element’s State of Matter: Gas (nonmagnetoc)
Group name: Noble gas
Density​: 1.784 kg/m 3
Color: Colorless
Boiling Point​: -185.85 c
Melting Point: -189.35 c
Discovered by: Lord Raleigh and Sir William Ramsay
When: 1894
Where: University Of Cambridge
3 Interesting Facts about argon:
Argon is used to cool the heads of heat-seeking missiles.

It was the first noble gas to be discovered.

Even though it is not poisonous, it can still cause suffocation because it displaces air due to its high density.

Video clip: http://m.youtube.com/watch?v=nrHVOFG2V-c

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