As a transition metal iron can have two oxidation states <span>F<span>e+</span>2</span> ferrous or <span>F<span>e+</span>3</span>ferric.
Oxygen has an oxidation state of <span>O<span>−2</span></span>.
In the case of <span>F<span>e2</span><span>O3</span></span> the oxidation states are balanced when 2 <span>F<span>e<span>+3</span></span></span> ions pair with 3 <span>O<span>−2</span></span>.
<span>F<span>e2</span><span>O3</span></span> is Iron (III) oxide where the roman numeral informs us that the charge on the iron is +3, the common name would be ferric oxide.
If the iron was <span>F<span>e<span>+2</span></span></span> and the oxygen <span>O<span>−2</span></span>, the formula would be FeO Iron (II) oxide or ferrous oxide.
Bohr thought that electrons orbited the nucleus in circular paths; whereas in the modern view atomic electron structure is more like 3D standing waves. Bohr built upon Rutherford's model of the atom. ... He believed that electrons moved around the nucleus in circular orbits with quantised potential and kinetic energies.
