Here's why:
* Covalent bonds form when atoms share electrons to achieve a stable electron configuration (filled outer shell).
* Carbon has 4 electrons in its outer shell and needs 4 more to be stable. Hydrogen has 1 electron and needs 1 more.
* By sharing an electron each, carbon and hydrogen both achieve a full outer shell, forming a strong covalent bond.
This is illustrated in molecules like methane (CH4), where the carbon atom shares one electron with each of the four hydrogen atoms.
