Single and double covalent bonds.


Hydrogen (H₂). Two hydrogen atoms can form a single bond.
Oxygen (O₂). Two oxygen atoms share two pairs of electrons to form a double bond.
Water (H₂O). Two hydrogen atoms and one oxygen atom are joined by single covalent bonds to produce a molecule of water.
Methane (CH₄). Four hydrogen atoms can satisfy the valence of one carbon atom, forming methane.

• Q: What kind of bonds form between these hydrogen atoms and carbon?
  • A: Single covalent bond.