Answer:
Step-by-step explanation:
We can use dot and cross diagrams to show how a pair of electrons forms a covalent bond.
Here is the dot and cross diagram for oxygen (O2), a diatomic molecule. Notice the lone pairs of electrons and the two shared pairs of electrons.
There are different kinds of covalent bonds:
a single covalent bond is when two atoms share a single pair of electrons. Represented by a single line (–).
a double covalent bond is when two atoms share two pairs of electrons. Represented by a double line (＝).
a triple covalent bond is when two atoms share three pairs of electrons. Represented by a triple line (≡).