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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

Question : 1
Total: 49
Solution:
(i)Cr3+(24):1s22s22p63s23p63d3
(ii) Pm3+(61):1s22s22p63s23p64s23d104p65s24d105p64f4
(iii) Cu+(29):1s22s22p63s23p63d10
(iv) Ce4+(58):1s22s22p63s23p64s23d104p65s24d105p6
(v) Co2+(27):1s22s22p63s23p63d7
(vi) Lu2+(71):1s22s22p63s23p64s23d104p65s24d105p64f145d1
(vii) Mn2+(25):1s22s22p63s23p63d5
(viii) Th4+(90):1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p6
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