SELECT * FROM question_mgmt as q WHERE id=1530 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=63 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Q1 : Write down the electronic configuration of:

(i) Cr3+    (iii) Cu+    (v) Co2+    (vii) Mn2+ 

(ii) Pm3+  (iv) Ce4+  (vi) Lu2+   (viii) Th4+

Answer:

(i) Cr3+: 1s2 2s2 2p6 3s2 3p6 3d3

Or, [Ar]183d3

(ii) Pm3+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d105s2 5p6 4f4

Or, [Xe]54 3d3

(iii) Cu+: 1s2 2s2 2p6 3s2 3p6 3d10

Or, [Ar]18 3d10

(iv) Ce4+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6

Or, [Xe]54

(v) Co2+: 1s2 2s2 2p6 3s2 3p6 3d7

Or, [Ar]183d7

(vi) Lu2+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d1

Or, [Xe]542f143d3

(vii) Mn2+: 1s2 2s2 2p6 3s2 3p6 3d5

Or, [Ar]18 3d5


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