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When writing the electron configuration for rubidium, it goes all the way up to the 5s row. But when writing 4s^2 and 3d^10, would you write the 3d^10 before or after the 4s^2, because both are filled. I think the filled 3d^10 would have more energy, but it also starts with 3 and being consistent with the numbers could also be the way to write it?
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