Argon!
Symbol: Ar
Atomic Number: 18
Type: Nonmetal
Phase at Room Temperature: Gas
Density: 0.0017837 grams per cubic centimeter
Melting Point: 83.80 K (-189.35°C or -308.83°F)
Boiling Point: 87.30 K (-185.85°C or -302.53°F)
Molar Mass: 39.948 g/mol
Atomic Radius: 0.94Å
Location in Periodic Table: Group 18, p-block, period 3
Valence electrons: 8
Electron Configuration: [Ne] 3s2 3p6
Atomic Number: 18
Type: Nonmetal
Phase at Room Temperature: Gas
Density: 0.0017837 grams per cubic centimeter
Melting Point: 83.80 K (-189.35°C or -308.83°F)
Boiling Point: 87.30 K (-185.85°C or -302.53°F)
Molar Mass: 39.948 g/mol
Atomic Radius: 0.94Å
Location in Periodic Table: Group 18, p-block, period 3
Valence electrons: 8
Electron Configuration: [Ne] 3s2 3p6