Identify the ion or unpaired electrons from a given spin-only magnetic moment

This type of question, asked 3 times: 24 Jan 2023, 10 Apr 2023, 4 Apr 2024. All 3 questions below, oldest first.

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Question 1
24 Jan 2023
50 $The magnetic moment of a transition metal compound has been calculated to be 3.87 B.M. The metal ion is$
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Question 2
10 Apr 2023
147 $For a metal ion, the calculated magnetic moment is 4.90 BM. This metal ion has _____ number of unpaired electrons.$
Question 3
4 Apr 2024
138 $A first-row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The atomic number of the metal is$
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Question 1