1. Audrey Looby Riley Stanford Janine Tobia
The Noble Gases Group 18
Audrey Looby
Riley Stanford
Janine Tobia

2. Meet The Family!
Helium-He 1s² Neon-Ne Argon-Ar Krypton-Kr Xenon-Xe Radon-Rn
np⁶
n=row #

3. Properties All are gases and non-metals
Low reactivity; helium, neon, and argon form no known compounds
Boil at extremely low temperatures
Non-conductive
Complete valence shells
All are found as free elements

4. Helium Lowest boiling point of all the elements
First identified in the sun’s spectrum
Isolated from uranium ores (alpha particles that are emitted pick up electrons)
Used by divers to dilute the oxygen that they breathe and in balloons
Obtained from liquid air
From the Greek, helios, meaning ‘the sun’

5. Neon Coming from the word neos meaning ‘new’
Produces the red light in neon signs
Liquid neon used as a cryogenic refrigerant, over 40 times the refrigeration capacity of helium, over 3 times the refrigeration capacity of liquid hydrogen
1/65000 parts of the atmosphere

6. Argon First noble gas to be discovered (1894)
Argon means ‘the lazy one’ in Greek
Used in electric lights, photo tubes, glow tubes, and lasers
Also used for welding
Used to protect from radioactive elements
Colorless, tasteless, and odorless
Makes up 1% of the Earth’s atmosphere

7. Krypton Reactive with Fluorine; only known compound is KrF₂
Not very useful commercially
Comes from the word kryptos meaning ‘hidden’

8. Xenon Has a wide range of compounds with O and Fluorine
First compound discovered in 1962 by Neil Bartlett
Means ‘stranger’ in Greek
Used in strobe lamps
Takes up 1/20 million of the atmosphere

9. Radon Very radioactive
Can form compounds, but can’t be studied due to its high reactivity
Used to treat cancer
Heaviest of the noble gases
When its cooled below its freezing point, it displays beautiful phosphorescence
Average concentration is 1/sextillion parts of air
Naturally occurs in some spring waters

10. The Noble Gases…
…like nobility, are nonreactive, and tend to remain apart. And now for a simple overview….

12. The End!