“Oxygen (O)”  [Atomic Number: 8] 

Oxygen

  In science, Oxygen (O) is a highly electronegative reactive nonmetal element, and by mass is the third most abundant element in the universe and the most abundant element by mass in the Earth's crust.
In elemental science, Oxygen (O), is a p-block element, located at the group 16, period 2 of the periodic table of elements.

Oxygen Biochemically

  Oxygen is required for respiration.

Oxygen (O) sometimes considered a member of the chalcogen group and is a highly reactive nonmetallic element, that readily forms compounds (oxides) with almost all other elements.

Oxygen Gas is a Colorless & Odorless

Oxygen (O) is a colorless, odorless gas, that compromises about 45.6 percent of the earth's crust, and 20.95 percent of our atmosphere.
  Examples of oxygen (O) include:

• singlet oxygen

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