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Oxygen is an element with the chemical formula O. An oxygen atom has atomic number 8, and gas total of 8 electron in each atom. An oxygen molecule has two atoms in it. Another form of oxygen called ozone has three atoms in a molecule.
An oxygen atom has 8 electron arranges in two shells. The inner shell has 2 electron and the outer shell, called valance shell has 6 electrons. To achieve stability the valence shell needs 8 electron in it. Therefore, in an oxygen molecule 2 pairs of electron in the valence shell are shared by by the two atoms. This makes the number of electron in outer shell of each atom equal to 8.
Oxygen molecule has a pair of oxygen atoms. So,the oxygen molecule is represented by the formula O2.
The oxygen atom has 8 elctrons. In the first K shell it has 2 electrons and in the L shell it has 6 electrons.
The electronic configuration of the oxygen atom is :
1s2 2s2 2p4.
In the outer Lshell there are 6 electrons (short of 2 electrons compared to noble gases).So if we pair the electrons,it require two more eletrons .So this could be made good by capturing 2 electrons or sharing with 2electrons.Therefore, two electrons of each of the atom in the oxygen molecule makes the double bond with each other to attain the stable configuration of noble gas.
Two oxygen atoms in a oxygen molecule share two electrons. Oxygen atoms only have 6 valence electrons (electrons in the outer shell). They want 8 electrons so they need to steal two or share two.
It is easier for two oxygen molecules to share their electrons then to find two atoms to steal one from or find one atom to steal two from. The two oxygen atoms share two electrons so that they each have 8 electrons in their outer shell and are therefore full.
They are bonded together with a covalent bond. A covalent bond is a strong bond when two atoms are sharing outer electrons.
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