Cyclopropene 2 electrons (n = 0); the delocalization is inturrupted due to sp3 methylene; Nonaromatic Cyclopropenyl cation 2 electrons (4n+2; n = 0); the delocalization of 2 electrons is possible throughthe empty p orbital;Aromatic Cyclopropenyl anion4 electron (even number of pairs; 4n, n = 1); Theoretically antiaromatic; not stable