Element , Element info, number of valence electrons, description of position
Found in nature , Used by people and properties make it appropriate
compounds the element can form, description of how the element was discovered
The order of presentation
The name of the element, including the origin of its name.
Helium, From modern Latin 19th century, Greek. Helios means "sun", because its existence was inferred from an emission line in the sun's spectrum.
The chemical symbol, average atomic mass, and atomic number for the element.
Symbol (He), Atomic mass 2, Atomic number is 4.002602
The number of valence electrons in a neutral atom of the element.
2 valence electrons
A description of the element's position, including a list of other elements that have similar properties
It's located in group 18, period 1, hydrogen
Description of where the element is commonly found in nature.
On earth, it's rare ( Texas, Oklahoma and Kansas).
How the element is commonly used by people.
Helium is used to inflate blimps, scientific balloons and party balloons. It is used as an inert shield for arc welding, to pressurize the fuel tanks of liquid fueled rockets
List five compounds the element can form.
Helium cannot form a compound, because it has a complete shell of electrons, and does not readily accept any extra electrons or join with anything to make covalent compounds.
Helium was discovered on the sun before it was found on the earth. Pierre-Jules-César Janssen, a French astronomer, noticed a yellow line in the sun's spectrum while studying a total solar eclipse in 1868.
How was the element discovered?
An interesting fact about the element.
Helium replaces oxygen in the lungs and can kill you if you inhale enough.