Here's why:
* Valence: The valence of an atom refers to its ability to form chemical bonds. It's determined by the number of electrons in the outermost shell of the atom, also known as the valence shell.
* Carbon's Valence: Carbon has four electrons in its valence shell. To achieve a stable configuration (like the noble gases), it wants to have eight electrons in this shell.
* Bonding: Carbon achieves this stability by forming four covalent bonds with other atoms. Each bond shares one electron from the carbon atom with one electron from another atom.
* Methane (CH4): In methane, carbon forms four single covalent bonds with four hydrogen atoms. Each hydrogen atom contributes one electron to the bond, completing the octet for carbon.
Therefore, the valence of carbon, with its four available bonding sites, dictates the formation of four bonds with hydrogen atoms in methane.
