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If it is an element, it could be either chromium (Cr) or molybdenum (Mo). You need to know more to know which. The electronic configuration for Cr is:
[Ar]3d54s1
and for Mo it is
[Kr]4d55s1

So both elements have 5 d-electrons and 1 s-electron. I'm not sure if that what you mean however by "s1d5"...

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16y ago
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Q: What is an element whose shorthand configuration is s1d5?
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