Kyokka ekituufu tekiba ekyo kubanga obusannyalazo mu butuufu busajjaalaatira (to inhibit) mu bibangirizo (regions of space) ebiyitibwa ‘ebibulungo” (ebyebulungo (orbitals). Ebibulungo n’ebyebulungulo (Orbits and orbitals) biwulikika nga ebifaanagavu kyokka birina amakulu ga njawulo ddala.