What role does the oxidation agent play in a redox reaction

The oxidizing agent receives electrons from the reducing agent.  Keep in mind that the reducing agent is the element in an oxidation-reduction reaction that gives an electron to another species. And since the reducing agent always loses its electrons, it is considered to call its condition 'oxidized'.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom