It doesn't necessarily "bonds to four other atoms."
The atom that has 6 protons is carbon, and carbon forms lots of chemical bonds with other atoms.
the presence or absence of double bonds between the carbon atom and other atoms
Each carbon atom can covalently bond with as many as four other other atoms. Answer is 4.
tetrahedral
Carbon can bond to a maximum of four other atoms.
A single carbon atom can bond with up to four other atoms.
Each carbon atom can make 4 bonds to other atoms, even when 'alone' as in methane (CH4, 4 single bonds) or carbon dioxide (CO2, 2 double bonds).
A carbon atom can form a maximum of four bonds with other atoms. A quaternary alcohol would require carbon to form five bonds: four to other carbon atoms and one to the oxygen of the hydroxyl group.
It can, but not always. In Methane, for example, it is bonded to four atoms of Hydrogen. But in Ethylene, each carbon atom is bonded to two atoms of Hydrogen, and share a double bond with each other. In Acetylene, each carbon atom is bonded to one atom of Hydrogen, and are triple bonded to each other. So while it always has four bonds, the bonds don't have to be made with four different atoms.
tetrahedral
4. Carbon obeys the octet rule. In covalent conpounds it has 4 covalent bonds. It can also form ionic compounds (carbides).
one carbon atom in C2H2 forms four bonds one bond with hydrogen and a triple bond with other carbon.