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Write down the electronic configuration of:
(i) Cr3++ (iii) Cu+(v) Co2+ (vii) Mn2+
(ii) Pm3+(iv) Ce4+ (vi) Lu2+(viii) Th4+ Asked by Rahul Last Modified 
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Answer
(i) Cr3+: 1s2 2s2 2p6 3s2 3p6 3d3
Or, [Ar]18 3d3
(ii) Pm3+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 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]18 3d7
(vi) Lu2+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d1
Or, [Xe]54 2f14 3d3
(vii) Mn2+: 1s2 2s2 2p6 3s2 3p6 3d5
Or, [Ar]18 3d5
(viii) Th4+: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 6s2 6s6
Or, [Rn]86
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