Helium
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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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Helium

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Helium

Helium


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


Helium

  • 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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