NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions
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Question : 1
Total: 49
Write down the electronic configuration of
(i) Cr3 +
(ii) Pm3 +
(iii) Cu+
(iv) Ce4 +
(v) Co2 +
(vi) Lu2 +
(vii) Mn2 +
(viii) Th4 +
(i) Cr
(ii) Pm
(iii) Cu
(iv) Ce
(v) Co
(vi) Lu
(vii) Mn
(viii) Th
Solution:
(ii) P m 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) (vi) L u 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) (viii) T h 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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