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Helen jill

on 7 April 2013

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Transcript of Helium

Helium Physical Properties Chemical Properties Boiling Temperature Melting History Uses Fun Facts Periodic Table noble Gas
lighter than air does not react to other elements 4.22 K,
−268.93 °C,
−452.07 °F 0.95 K,
−272.20 °C,
−457.96 °F Discovery: August 18, 1868

Who: Pierre Janssen and Norman Lockyar

How: during an eclispe they say a bright yellow line in the sun Lockyar first proposed that that was a new element Blowing up balloons
when welding, used to make a protective atmosphere
fuel for light weight air crafts
a mixture of helium and oxygen can help scuba divers survive in high pressure by making an artificial atmosphere
cooling magnets
changing human voices
25% is used in cryogenics which is the study of the behavior of elements in low temperatures atomic
number symbol Name atomic weight The name helium comes from the old sun god Helios
about 25% of Earth's atmosphere is made up of helium atoms
it becomes a super liquid? at -271 degrees C
when it's cold helium can rise against the walls of the container and escape
second least reactive of noble gases
second lightest element
the universe's second most abundant element after hydrogen Group: 18

Period: 1

Block: S
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