Answer the following question given this paragraph: 

Some molecules are not able to satisfy the octet rule by making only single covalent bonds between the atoms. Consider the compound ethene, which has a molecular formula of C 2 H 4 . The carbon atoms are bonded together, with each carbon also being bonded to two hydrogen atoms.


Q: The carbon atoms are bonded together, with each carbon also being bonded to two of what kind of atoms?


A:
hydrogen