Colson,+Hanna

=Helium

=

The symbol of helium is He

Atomic # 2

Helium’s standard state is gas at 298 k

Its group number in the periodic table is 18

It is colorless


 * Melting point is 0.95 [or -272.2 °C (-458 °F)] K[[image:lvscience/helium-atom.jpg width="173" height="171" align="right"]]


 * Boiling point is 4.22 [or -268.93 °C (-452.07 °F)] K

Density of it is 214 kg m

[] high-helium concentrations exist where there is ample Uranium and Thorium in the basement “granitic” rock.

Number of protons and electrons is 2

Helium is used to fill baloones

Helium’s atomic mass is 4.00

Helium is $0.53 per gram []

Its electron configuration is 1s2

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number of valence electrons is 0

<span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">Pierre Janssen was a French astronomer who discovered helium he was observing a solar eclipse in India when he noticed a yellow spectral emission line of the elements.

<span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">Helium was discovered in 1868

<span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">[]

<span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">Helium does not react with anything

<span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">Fun Facts <span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">helium is the second lightest element <span style="font-family: 'Helvetica','sans-serif'; font-size: 16px;">when you inhail helium it makes your voice high pitched