Is the element shown in this image an ion, isotope, or neutral atom?

In an energy pyramid, which level has the most available energy?

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

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%