`Ce^(+ 4)` ion is isoelectronic with
`Ce^(+ 4)` ion is isoelectronic with
A. `La^(+3)`
B. `Gd^(+3)`
C. `Lu^(+3)`
D. Both (a) and (c)
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Correct Answer - A
`Ce^(4+) to [Xe] 4f^0 5d^0 6s^0 , La^(3+) to [Xe] 4f^0 6d^0 6s^0`
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