- What is the oxidation number for sodium?

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Find the energy of the photon required to excite a hydrogen atom from the n=1 state to the n=5 state.? Can what we see as mathematics actually always represent reality? How can something be finite and by the same token have no boundary which means infite? What is the molecular formula of a molecule if its molar mass is 290 g/mol and its empirical formula is C6H8O? Need to solve (x-2)(x-3)(x-4)(x-5) = 8. Thanks?