In CH4 , four sp3 hybrid orbitals are overlapped by hydrogen 1s orbitals , yielding four σ ( sigma ) bonds ( that is , four single covalent bonds ) of equal length and strength .
In CH4 , four sp3 hybrid orbitals are overlapped by hydrogen 's 1s orbital , yielding four σ ( sigma ) bonds ( that is , four single covalent bonds ) of the same length and strength .