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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
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Question : 1 of 49
Marks: +1, -0
Write down the electronic configuration of
(i) Cr3+{}^{3+}
(ii) Pm3+{}^{3+}
(iii) Cu+{}^{+}
(iv) Ce4+{}^{4+}
(v) Co2+{}^{2+}
(vi) Lu2+{}^{2+}
(vii) Mn2+{}^{2+}
(viii) Th4+{}^{4+}
Solution:  
(i)Cr3+(24):1s22s22p63s23p63d3(i) \mathrm{Cr}^{3+}(24) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{3}
(ii) Pm3+(61):1s22s22p63s23p64s23d104p65s24d105p64f4\mathrm{Pm}^{3+}(61) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6} 4 f^{4}
(iii) Cu+(29):1s22s22p63s23p63d10\mathrm{Cu}^{+}(29) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10}
(iv)Ce4+(58):1s22s22p63s23p64s23d104p65s24d105p6(iv) \mathrm{Ce}^{4+}(58) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6}
(v) Co2+(27):1s22s22p63s23p63d7\mathrm{Co}^{2+}(27) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{7}
(vi) Lu2+(71):1s22s22p63s23p64s23d104p65s24d105p64f145d1\mathrm{Lu}^{2+}(71) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{10} 4 p^{6} 5 s^{2} 4 d^{10} 5 p^{6} 4 f^{14} 5 d^{1}
(vii) Mn2+(25):1s22s22p63s23p63d5\mathrm{Mn}^{2+}(25) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5}
(viii) Th4+(90):1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p6\mathrm{Th}^{4+}(90) : 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} 4 d^{10} 5 s^{2} 5 p^{6} 4 f^{14} 5 d^{10} 6 s^{2} 6 p^{6}
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