What is formed is a single covalent bond because each atom requires one more electron to complete its octet.
Let us recall that a bond is formed between two atoms when we have to atoms bonded together, the atoms are connected by means of a chemical bond. There are different kinds of bonds that are used to connect atoms together such as;
When we talk about a diatomic molecule, we are talking about a molecule that is composed of two atoms that are exactly the same. This implies that the electronegativities of the atoms must be the same and the bond that is formed would be a nonpolar covalent bond. There are so many of such kinds of molecule that we have in chemistry such as the oxygen molecule, the hydrogen molecule, the fluorine molecule and so on.
Thus, given that diatomic molecule shares a single pair of electrons, we can say that this is a single covalent bond because each atom requires one more electron to complete its octet.
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