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Choose the correct statement (s) about e...

Choose the correct statement (s) about electronic configuration of lanthanides:

A

all the tripositive ions of the series are of the form `4f^(n)` (n=1 to 14 with increasing atomic number)

B

E.C. of Gd `= [Xe] 4f^(7) 5d^(1) 6s^(2)`

C

E.C. of `Gd^(2+) = [Xe] 4f^(7) 5d^(1)`

D

E.C. of `Ce = [Xe] 4f^(1) 5d^(1)6s^(2)`

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The correct Answer is:
A, B, C, D
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