Here's why:
* Valence Electrons: Oxygen has six valence electrons (electrons in its outermost shell).
* Octet Rule: Atoms tend to gain, lose, or share electrons to achieve a stable configuration of eight valence electrons (the octet rule).
* Bonding: Oxygen can achieve a stable octet by forming two single bonds, which allows it to share two electrons with another atom.
Example: In water (H₂O), the oxygen atom forms two single bonds with two hydrogen atoms.
