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Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium ?

1. [Xe]4f7 6s2
2. [Xe]4f7 5d1
3. [Xe]4f7 5d1 6s2
4. [Xe]4f7 6s2 5d1

Correct answer: [Xe]4f7 5d1 6s2

Solution

Gadolinium (atomic number 64) has a stable half-filled 4f7 configuration, and to achieve this, one electron occupies the 5d orbital along with the 6s2 electrons. Thus, the correct configuration is [Xe]4f7 5d1 6s2.

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