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Helium - PowerPoint PPT Presentation


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Helium. I am element He. My discoverer is Pierre Janssen in 1868 I am found in group 18, period 1 My atomic number is 2 I have: 2 protons 2 neutrons 2 electrons. I’m used in NASA’s space shuttle to help it into space Helium is found when Thorium and Uranium isotopes decay

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Presentation Transcript
i am element he
I am element He
  • My discoverer is Pierre Janssen in 1868
  • I am found in group 18, period 1
  • My atomic number is 2
  • I have:
    • 2 protons
    • 2 neutrons
    • 2 electrons
slide3

I’m used in NASA’s space shuttle to help it into space

  • Helium is found when Thorium and Uranium isotopes decay
  • I’m used in the process of heat treating
  • I am used in:
    • The filling of blimps
    • Supersonic windtunnels
    • Welding
    • Pressurizing liquid fuel rockets
    • Low temperature cooling systems
properties
Properties
  • Physical
    • Boiling point:
    • -268.6 C/ -451.48 F
    • Melting point:
    • -272 C/ -457.6 F
    • Density: 0. 1785 g/ml
  • Chemical
    • Noble gas
    • Does not react with other elements
    • Two valence electrons
    • Very stable
facts
Facts
  • I am non toxic
  • I don’t burn
  • I do not exist in the human body
  • I was discovered in the Suns atmosphere before I was discovered on Earth
facts1
Facts
  • The world production is 30,000 metric tons a year
  • 3,000 of those metric tons come from the decay of thorium and uranium
  • I am the second most abundant element in the universe
  • In 1929 helium became available on the open market
facts2
Facts
  • I am so light that Earth’s gravity is not strong enough to hold onto me
  • I am one of the two elements that have never been observed forming compounds\
  • I was originally thought to be a metal
  • I am used to treat asthma
facts3
Facts
  • I am lighter than air
  • I never freeze
  • I have the lowest melting point of all the elements
  • I am colorless, odorless and tasteless
  • I have 8 isotopes
facts4
Facts
  • I am slightly heavier than hydrogen
  • I am used in MRI technology and in breathing assistance for premature infants
  • The United States contols 30% of the worlds helium supply
    • It is expected to run out by 2018
what happens when you breathe me in
What happens when you breathe me in?
  • The vibration of the vocal chords is independent on the gas that surrounds them
  • The velocity of the sound waves is faster in helium and wavelengths greater, the frequency doesn’t change.
  • But the timbre or quality of the sound changes
  • It is this lesser density of helium flowing through the larynx that produces this differing quality in the voice
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