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हुण्ड के नियम की सहायता से `Ce^(3+)` आयन का इलेक्ट्रॉनिक विन्यास लिखिए तथा प्रचक्रण मात्र सूत्र के आधार पर इसका चुम्बकीय आघूर्ण ज्ञात कीजिए |

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`""_(58)Ce:[Xe]4f^(1)5d^(1)6s^(2),Ce^(3+):[Xe]5f^(1)`.
`Ce^(3+)` आयन में केवल 1 अयुग्मित इलेक्ट्रॉन उपस्थित है |
`mu = sqrt(n(n+2)) = sqrt((1+2))=sqrt(3) = 1.73` BM

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