HELIUM

HISTORY

• Helium is extracted from natural gas deposits deep within the Earth
• Discovered in India by Pierre-Jules-César Janssen during the solar eclipse of 1868
• Named after "Helios," the Greek god of the sun
• No ancient uses
• Symbol: He

PERIODIC PROPERTIES

• Noble gas
• Period 1
• Atomic Number: 2
• Atomic Weight: 4.002602
• Ionization Energy: 24,5874

PERIODIC PROPERTIES

• Electron Configuration 1s²

ORBITAL NOTATION

ELECTRON DOT FORMULA

PHYSICAL PROPERTIES

• Phase: Gas
• Melting Point: -272.2°C
• Boiling Point: -268.93°C
• Tasteless
• Colorless

PHYSICAL PROPERTIES

• Odorless
• Lighter than air
• Floats

CHEMICAL PROPERTIES

• Non-Flammable
• Non-Toxic
• Inert

BOHR MODEL

USES

• Used in various types of balloons
• Used in some neon lights
• Used in low temperatures to achieve conductivity state
• Used in helium-oxygen mixtures for divers
• Used as a shielding gas in welding

COST: $0.052 PER GRAM