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

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

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

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’

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

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

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

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

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

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

The End!