by Jenna Sosebe

My Element is Argon. Argon's symbol is Ar. Its atomic number is 19 and its mass number is 39.948. It's in period number 3 and group number 18. It's group name is Noble Gas, so therefore it is a gas. Argon is a non-metal. Argon gas is used in arc welding, used in flourecent lights, and makes up about 1% of the earth's atmosphere.