I have a confusing question mainly due to my lack of understanding of Quantum Mechanics and spin!! here it goes anyway... In an atomic orbital, like the 1s orbital, two electron waves with opposite spins occupy the same area of space. Now, does this mean that their waves should interfere with each other? Does the "oppositeness" of their spins mean their waves are also opposite? and if so, would this lead to destructive interference and therefore annihilation of electrons?