Oxygen with 6 electrons in the outer electron shell that nee

Oxygen with 6 electrons in the outer electron shell (that needs 8 to be complete), can make how many covalent bonds? A 6 B 2 C 0 D 4

Solution

ANS: B. 2

Oxygen molecule formula is O2.

Oxygen atom electronic configuration is 1s2 2s2 2p4.

Oxygen molecule can contain 8 electrons (In K shell contains 2 electrons and the L shell had 6 electrons).

In single oxygen molecule can contains 6 valence electrons in the outer shell. They want 8 electrons so they need to share two electrons so that they each have 8 electrons.

Each oxygen atoms can form with 2 covalent bonds. 2 pair of electrons is shared in an oxygen molecule (double bonds), it only forms two bonds.