1.

निम्न का इलेक्ट्रॉनिक विन्यास लिखिये - `{:((i),Cr^(3+)",",(ii),Pm^(3+)","),((iii),Cu^(+)",",(iv),Ce^(4+)","),((v),Co^(2+)",",(vi),Lu^(2+)","),((vii),Mn^(2+)",",(viii),Th^(4+)","):}`

Answer» `(i) Cr^(3+):[Ar]3d^(3), (ii) Pm^(3+) :[Xe]4f^(4), (iii) Cu^(3+):[Ar]3d^(10),`
`(iv) Ce^(4+):[Xe]4f^(0), (v)Co^(2+):[Ar]3d^(7), (vi) Lu^(2+):[Xe]4f^(14) 5d^(1),`
`(vii) Mn^(2+):[Ar]3d^(5), (viii) Th^(4+):[Rn]5f^(0).`


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