Beryllium has four protons in its nucleus. how many neutrons are in beryllium-9? explain how you calculated your answer

Which of the following is the correct formula for copper (i) sulfate trihydrate? cuso4 · 3h2o cuso4(h2o)3 cu2so4(h2o)3 cu2so4 · 3h2o

Using the periodic table, complete the following. element: hydrogen symbol: h₂ molecular weight: g mass of one mole: g/mol

Fred is studying a substance that is made out of only one element. this means that