Which statement describes the number of protons in each atom of an element?

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

Once similarity and one difference between a mixture of elements and a mixture of compounds

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these