When an electron of an atom returns from an excited state to the ground state, it emits energy in the form of a photon. how does the change in energy level compare to the energy of the emitted photon?

Select the atomic models that belong to the same element

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer