In ethylene ( ethene ) the two carbon atoms form a σ bond by overlapping two sp2 orbitals and each carbon atom forms two covalent bonds with hydrogen by s-sp2 overlap all with 120 ° angles .
In ethylene ( ethene ) , the two carbon atoms form a σ bond by overlapping two sp2 orbitals and each carbon atom forms two covalent bonds with hydrogen by s-sp2 overlap all with 120 ° angles .