Non radioactive carbon 13 has 7 protons per atom.
To find the number of neutrons, you subtract the atomic number from the mass number of element X. So in this case, it'll be 151-44= the number of neutrons.
Iodine clock reaction is a combination of hydrogen peroxide and sulfuric acid. When these are poured together, there is no reaction at first, but after time, a colored reaction will happen to the liquid and may change back to the original color. This idea was discovered by Hans Landolt in the late 1800s.
