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- Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?Option: 1</stron
- #Classification of Elements and Periodic table
- #Joint Entrance Examination Main
- #Engineering
- #Chemistry
- #Amrita Engineering Entrance Examination
Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
[Xe]4f75d16s2
[Xe]4f65d26s2
[Xe]4f86d2
[Xe]4f95s2
Answers (1)
Classification of Elements : f-block -
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The elements placed in two separate rows at the bottom of the periodic table are f-block elements.
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These elements have their last electron enters into the f-orbital.
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The elements from cerium to lutetium having incomplete 4f-orbitals are known as lanthanoids.
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The elements from thorium to lawrencium having incomplete 5f-orbitals are known as actinides.
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The general electronic configuration of f-block elements is (n-2)f1-14(n-1)d1-2ns2.
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Gadolinium
Z=64
symbol: Gd
block: f-block
period: 6th period
Electronic configuration
expected: [Xe]4f8 6s2
observed:[Xe]4f7 5d1 6s2
Reason: Half filled f-orbital is more stable than partially filled f-orbital and since energy difference is not much between 4f orbital and 5d orbital thus 1 electron from 4f orbital(expected to have 8electrons) jumps to 5d orbital making it 5d1 thus deviating from the expected configuration and conferring stability through Hund's rule of maximum multiplicity.
So, correct option is (1)
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