Hydrogen is a special element because it is
not like any other group of elements.
It is placed above Group 1 in the periodic
table because it has one electron in its valence
shell but does not belong in the alkali metals
group.
Hydrogen is found in stars and it is the most
abundant element in the universe.
However, it only makes up one percent of the
Earths mass.
On Earth, most hydrogen is combined with oxygen
in the form of water.
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