Facts+about+Argon+Yazan

=**Facts about Argon**=

Symbol: Ar Atomic Number: 18 Atomic Mass: 39.95 amu Melting Point: -189.3 Celsius -83.85 Kelvin Boiling Point: -186 Celsius -87.15 Kelvin Crystal Structure: Cubic Color: Colorless**
 * Name: Argon
 * Number of protons/electrons: 18**
 * Number of neutrons: 22**