Question

which atom combine with itself to make 4 bonds

Answer 1

#I think Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds. When it bonds only with hydrogen, it forms compounds called hydrocarbons. Carbon can form single, double, or triple covalent bonds with othercarbon atoms.
If it is the thing you want then its fine

Answer 2

I thik the answer is carbon