2H₂O⇒4e⁻ + 4H⁺ using this equation <span> the electrons replace the lost ones in chlorophyl photolysis occurs. </span>photosystem II "splits" water <span>To replace its lost electrons </span> Produces oxygen 2 H2O 4 H 4 e- O2 <span>This process is called oxygenic photosynthesis</span>