sentences:  The hydroxymethylium group in adducts can potentially be further hydrated to form dihydroxymethylium (), or be oxidised by water to form formylium ().The electrons in atomic carbon are distributed among the atomic orbitals according to the aufbau principle to produce unique quantum states, with corresponding energy levels.The state with the lowest energy level, or ground state, is a triplet diradical state (3"P"0).