In the reaction Mg (s) + 2HCl (aq) → H2 (g) + MgCl2 (aq) , what is the species oxidized, species reduced, oxidizing agent, reducing agent? And what is the Oxidation half-reaction and Reduction half-reaction?

Which of the following statements is true? an atom consists of protons, electrons, and neutrons.an atom consists of protons and neutrons.an atom consists of electrons bonded to one another.an atom consists of protons bonded to one another.