Alyssa Poston
Published on Nov 18, 2015
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PRESENTATION OUTLINE
HELIUM
ATOMIC #- 2 ATOMIC SYMBOL- He
ATOMIC MASS- 4.0026 G
- Protons- 2
- Neutrons- 2
- Electrons- 2
- Electron Configuration- 1s2
WHEN IT WAS DESCOVERED- 1895
- Who discovered-
- Pierre Janssen and Norman Lockyer
WHERE IT CAN BE FOUND- IN THE ATMOSPHERE OF SPACE
4 PHYSICAL DESCRIPTIONS
- Colorless
- Non-metal
- Density- 214 kg
- Gas at room temperature
5 USES OF HELIUM
- Cryogenics
- Used to cool super conducting magnets in MRI scanners
- Pressurize and purge systems of unwanted gases
- Used as a protective gas when growing silicon
- Used in supersonic wind tunnels
Untitled Slide
- Valence electrons- 0
- Group,Period- 18,1
