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The f-block elements of the periodic table contains those elements in which:

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only 4f orbitals are progressively filled in 6th period.

only 5f orbitals are progressively filled in 7th period.

4f and 5f orbitals are progressively filled in 6th and 7th periods respectively.

none of these

answer is C.

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Detailed Solution

Electronic configuration of f-block element $(n - 2) f^{1 - 14}, (n - 1) d^{10}, {ns}^{2}$ f-block starts with 6th period (n = 6).

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