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Electronic configuration of 3d elements (half-filled d, ns1, unpaired electrons)

This type of question, asked 4 times: 4 May 2023 S1, 9 May 2024 S2, 12 May 2024 S2, 13 Apr 2026 S1. All 4 questions below, oldest first.

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  1. Question 1

    4 May 2023 S1

    90
    Which pair of elements from following has half-filled d-orbital in observed electronic configuration?

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  2. Question 2

    9 May 2024 S2

    100
    Identify the element from following having six unpaired electrons in observed electronic configuration?

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  3. Question 3

    12 May 2024 S2

    63
    Which element from following possesses half filled d-orbital either in expected or in observed electronic configuration?

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  4. Question 4

    13 Apr 2026 S1

    2
    What is the atomic number of an element having ns1ns^1 electronic configuration and belonging to 3d transition series?

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