What is Covalent Bond?
Covalent bond is a bond formed by atoms, each of atom creates an electron pair and shares it. Because each other's electrons are shared in pairs, the number of electrons involved in sharing is always even.
The electron pair that participates in the covalent bond is called the "shared electron pair", and the electron pair that does not participate in the covalent bond is called the "unshared electron pair".
It is divided into 'single bond', 'double bond' and 'triple bond' depending on the number of electron pairs shared between two atoms.
Two atoms share one electron pair (or two electrons).
It is represented by a single line between atoms.
F-F (Fluorine molecule)
Two atoms share two electron pairs (or four electrons).
It is represented by double lines between atoms.
O=O (Oxygen molecule)
The two atoms share three electron pairs (or six electrons).
It is represented by a triple line between atoms.
N≡N (Nitrogen molecule)