Spin-only magnetic moment of Cu2+ in BM

The same question, asked 3 times: 12 May 2024 S1, 26 Apr 2025 S2, 15 Apr 2026 S1. Every wording below, oldest first.

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Question 1
12 May 2024 S1
88 $What is the numerical value of spin only magnetic moment of copper in +2 state?$
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Question 2
26 Apr 2025 S2
91 $Cu^{2 +}$
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Question 3
15 Apr 2026 S1
34 $\mathrm{Cu^{2+}}$
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