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Going off of Becky, the rule is that the s orbital has higher energy than the d orbital when there is an electron present in the s orbital (s > d), but when there is no electron in the s orbital, it has lower energy than the d orbital (s < d). Thus in electron configurations, because you have to fill the s orbital before filling the d orbital, the s orbital will have a higher energy than the d orbital. So in terms of ionization energy, the first electrons removed from the atom would be from the s, in this case the 5s orbital, before the d orbital, thus being placed in name configuration after the d orbital to represent this.
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