What is the sum of the oxidation states of atoms in a molecule? What is the sum of the oxidation states of atoms in a complex ion?

What is the sum of the oxidation states of atoms in a molecule? What is the sum of the oxidation states of atoms in a complex ion? What is the oxidation state of atoms of elements in their simple substances?

The sum of the oxidation states of atoms in a molecule must be equal to zero.
In a complex ion, the sum of the oxidation states is equal to the charge of the complex ion.
The sum of the oxidation states of the atoms of elements in their simple substances is zero.

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