GROUP 8A

NOBLE GASES

• All gases are inert
• Inert - unable to react with other elements
• Each element has exactly 8 valence electrons
• Helium only has 2 valence electrons
• Helium is placed in this group because it is inert

HELIUM

PHYSICAL PROPERTIES

• State at room temperature: gas
• General appearance: colorless
• Boiling point: -268.93 degrees C
• Melting point: -272.2 degrees C
• It was discovered on sun before on earth

CHEMICAL PROPERTIES

• General reactivity: unable to react with other elements
• It's world uses are:
• Blowing up balloons
• Pressurize fuel tanks of liquid fueled rockets
• Liquid helium is in superconducting magnets

NEON

PHYSICAL PROPERTIES

• State at room temperature: gas
• General appearance: colorless
• Boiling point: -246.08 degrees C
• Melting point: -248.59 degrees C
• Density: 0.0008999 g/cm^3

CHEMICAL PROPERTIES

• General Reactivity: highly inert
• It's world uses are:
• Advertising signs
• Cryogenic refrigerant
• Lightning arresters

ARGON

PHYSICAL PROPERTIES

• State at room temp: gas
• Appearance: colorless
• Melting point: -189.3 degrees C
• Boiling point: -185.8 degrees C
• Density: 0.001784 g/cm^3

CHEMICAL PROPERTIES

• General activity: inert
• World uses:
• Electric light bulbs
• "Blankets" reactive elements
• Welding and cutting

KRYPTON

PHYSICAL PROPERTIES

• State at room temp.: gas
• Appearance: colorless
• Melting point: -157.36 degrees C
• Boiling point: -153.22 degrees C
• Density: 0.003708 g/cm^3

CHEMICAL PROPERTIES

• General reactivity: inert
• World uses:
• Lightbulbs

XENON

PHYSICAL PROPERTIES

• State at room temperature: gas
• Colorless, odorless, heavy
• Density: 0.00588 g /cm^3
• Melting point: -118.8 degrees C
• Boiling point: -108.1 degrees C

CHEMICAL PROPERTIES

• General reactivity: inert
• World uses:
• Photographic flashes
• High pressure arc lamps for ultraviolet light
• Hgih pressure arc lamps for motion pictures

RADON

PHYSICAL PROPERTIES

• State at room temp.: gas
• Appearance: colorless, odorless, heavy
• Melting point: -71 degrees C
• Boiling point: -62 degrees C
• Density: 0.00973 g/cm^3

CHEMICAL PROPERTIES

• General reactivity: inert
• World uses:
• Radiotherapy to treat cancer