<Dd> L 2 = l (l + 1) ħ 2 (\ displaystyle L ^ (2) = l (l + 1) \ hbar ^ (2) \,) </Dd> <Dd> where l (\ displaystyle l) is a non-negative integer and ħ (\ displaystyle \ hbar) is the reduced Planck constant . </Dd> <P> Also, for a diatomic molecule the moment of inertia is </P> <Dl> <Dd> <Dl> <Dd> I = μ r 0 2 (\ displaystyle I = \ mu r_ (0) ^ (2) \,) </Dd> </Dl> </Dd> <Dd> where <Dl> <Dd> μ (\ displaystyle \ mu \,) is the reduced mass of the molecule and </Dd> <Dd> r 0 (\ displaystyle r_ (0) \,) is the average distance between the centers of the two atoms in the molecule . </Dd> </Dl> </Dd> </Dl>

Where are elements that form molecules of two of the same atoms commonly found on the periodic table