What is the strongest element on the periodic table of elements?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

What is the percent by mass of oxygen in fe2o3