Write a balanced half-reaction for the reduction of liquid water H2O to aqueous hydrogen peroxide H2O2 in basic aqueous solution. Be sure to add physical state symbols where appropriate.

Atoms are made of extremely tiny particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom, making up the nucleus. ... The charge on the proton and electron are exactly the same size but opposite. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.