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What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

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?

If an atom has 12 protons and 13 neutrons