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Chemistry help please? :3

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Well, A and B first options are wrong so we can skip that.
In C, the first is right but the second is wrong. (They are much more easier to calculate:p)

Thus, we don't need to find Cr. Though I guess all Group 1 elements have S^1.
But I think you should also know that Cr is transition metal but here it is an exception in electronic configuration. Do you know why?
 
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