The Noble Gases Group 18

Audrey Looby

Riley Stanford

Janine Tobia

The Noble GasesGroup 18

Helium-He 1s²Neon-Ne Argon-ArKrypton-KrXenon-Xe Radon-Rn

Meet The Family!

np⁶n=row #

• 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

Properties

• 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’

Helium

• 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

Neon

• 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

Argon

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

Krypton

• 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

Xenon

• 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

Radon

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

The Noble Gases…

The End!