Helium

In Glogpedia

by GraceBlanch
Last updated 5 years ago

Discipline:
Science
Subject:
Chemical Elements
Grade:
8

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Helium

Helium was discovered on the sun before it was found on earth. While a French astronomer, named Pierre-Jules-César Janssen, studied a total solar eclipse in 1868, he noticed a yellow line in the sun’s band of colours. After this discovery, Sir Norman Lockyer, an English astronomer, found that this yellow line could not be produced by any element known on the earth at this time. A new element had been theorized, and the sun was responsible for it. This new and unknown element was named helium by Sir Norman Lockyer.

Helium is non-toxic. This is one of the reasons why balloons were replaced with Helium from Hydrogen.

Helium's atomic number is 2. It's mass is 4.002602. Helium's atmoic symbol is He. Helium is a special gas; along with Neon, Argon, Krypton, Xenon and Radon; they are called noble gases. This means, these elements cannot form compounds. Compared to the other Noble gases, Helium has less electrons in its shell. The other noble gases have 8, while Helium has 2 (giving it the atomic number 2) Helium gas is an unreactive, colourless, and odourless monoatomic gas. Helium is the second-least reactive noble gas after neon.

Helium can be purchased in tanks

The effects of Helium

You can find Helim in presurized tanks. Helium has the lowest melting point, at -272.2 °C, and the lowest boiling point, at -268.93 °C, of the elements, so it only exists as a gas, except under extreme conditions. Helium is the best refrigirator in the universe. It is used on space shuttles to cool the hydrogen and oxygen fuels. Helium, the gas of space, has a vital role to play in affecting our our first steps into space.The main use of helium on Earth is for cooling down scientific equipment for special purposes such as body scanners.

Helium is lighter than air, meaning it floats.

After the disastrous Hindenburg disaster in 1937, which was the destruction of a German airship, balloons and zeppelins were replaced with helium from hydrogen. The cause of this decision was that hydrogen is extremely flammable and dangerous to people. Helium isn’t flammable, so is safe.

Why Helium changes our voices

www.education.jlab.org/itselemental/ele002.htmlwww.webelements.com/heliumwww.rsc.orgperiodic-table/element/2/helium


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