The electronic configuration of gadolinium (Atomic number 64) is

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C
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4f7 5d1 6s2
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

Xe 6s2 4f7 5d1
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

6s2 4f7 5d1
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PGT CHEMISTRY 12 year experience teaching XI-XII Students

6s2 4f7 5d1
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Chemistry lover

The answer is C 4f7 5d1 6s2, this is the exception if u will follow electronic configuration rule but here point u need to remember such type of element, we have also seen like Chromium(Cr), Cupper(Cu).
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option c.
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Option c
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Related Questions

How should I do self-study of chemistry class 12 without any coaching to get a perfect score?
first you should know all the basic concepts and practise it . and watch youtube videos which is related to topics. it is more than enough to get a decent score. And also refer the old Model Question Papers.
Aditya
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Which of the following is not a peroxide?
(a) KO2(b) CrO5(c) Na2O2 (d) BaO2
Correct answer is option (c). Because A peroxide is a compound containing oxygen oxygen single bond. The way you can identify it when it is in a compound is by using the valence electron of the partner...
Tripti
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5
In a metallic bond, why positive ions are called kernels, not cations?
The kernel is an atom without its valence electrons that are weakly bonded; no electron belongs to one nucleus, valence electrons can move one kernel to another. So it is known as kernel, not cation (have valency).
Shiva Institute of Science and Technology

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