The name oxygen was first used by French chemist Antoine Laurent Lavoisier
in 1777. Oxygen is essential to human life. In fact, it plays many
important roles on Earth. Oxygen is found in the air we breathe and
the water we drink (H20). It is an element with the chemicalsymbol “O” and atomic number 8.
Oxygen makes up around 21 percent of the air we breathe. It is also
the most common element in the Earth’s
crust (around 47 percent)
and the third most common element in the universe after the elements
hydrogen and helium.