Here's why:

* Carbon's Valence: Carbon has 4 valence electrons, meaning it can form 4 bonds.

* Hydrogen's Valence: Hydrogen has 1 valence electron, meaning it can form 1 bond.

* Structure: In methane, the carbon atom is bonded to four hydrogen atoms, each with a single covalent bond.

This results in a tetrahedral structure with bond angles of 109.5 degrees.