Given the following isotope masses, calculate the atomic mass of magnesium. 78.99% 24Mg = 23.985042 amu 10.00% 25Mg = 24.985837 amu 11.01% 26Mg = 25.982593 amu

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?