Balance the following chemical equations.
A. Na + Cl2 ⇒ NaCl
B. Na + H2O ⇒ NaOH + H2
C. Mg + O2 ⇒ MgO
D. KClO3 ⇒ KCl + O2
E. Al + CuO ⇒ Al2O3 + Cu
F. I2 + Na2S2O3 ⇒ NaI + Na2S4O6
G. Mg + P4 ⇒ Mg3P2

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.