Oxygen (O2)

* Composition: Two oxygen atoms bonded together.

* Structure: Linear (atoms in a straight line).

* Type of bond: Double covalent bond (two pairs of shared electrons).

* State at room temperature: Gas.

* Role: Essential for respiration in living organisms, plays a key role in combustion (burning).

Methane (CH4)

* Composition: One carbon atom bonded to four hydrogen atoms.

* Structure: Tetrahedral (carbon atom in the center with hydrogen atoms at the corners of a pyramid).

* Type of bond: Single covalent bond (one pair of shared electrons) between carbon and each hydrogen atom.

* State at room temperature: Gas.

* Role: A powerful greenhouse gas, a major component of natural gas, used as a fuel.

Key Differences:

* Atoms: Oxygen is composed of two oxygen atoms, while methane contains one carbon atom and four hydrogen atoms.

* Structure: Oxygen molecules are linear, while methane molecules are tetrahedral.

* Bonding: Oxygen has a double bond, while methane has four single bonds.

* Properties: Oxygen is essential for respiration, while methane is a fuel and a greenhouse gas.

Let me know if you have any other questions!