An isotope of which element has an atomic number of 6 and a mass number of 14

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate

What does a numerical subscript following an element in a chemical formula mean?

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as