Here's why:

* Hydrogen (H) has a +1 charge when it forms a bond.

* Oxygen (O) has a -2 charge when it forms a bond.

In hydrogen peroxide, each oxygen atom is bonded to one hydrogen atom and one other oxygen atom.

* The two hydrogen atoms contribute a total of +2 charge.

* The two oxygen atoms contribute a total of -4 charge.

The overall charge of the molecule is +2 - 4 = -2. However, since there are two oxygen atoms, the charge is divided equally, resulting in a neutral molecule.