Here's why:

* Electronic Configuration: Carbon has an atomic number of 6, meaning it has 6 electrons. Its electronic configuration is 2,4. This means it has 2 electrons in the first shell and 4 electrons in the second shell.

* Valence Electrons: The outermost shell electrons are called valence electrons. In carbon's case, these are the 4 electrons in the second shell.

* Sharing: Carbon can share its 4 valence electrons with other atoms to form covalent bonds. This allows it to achieve a stable octet (8 electrons) in its outermost shell.

This ability to form four bonds makes carbon a unique and versatile element, allowing it to create a vast array of organic molecules.