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Number of unpaired electrons from the electronic configuration

This type of question, asked 5 times: 2 May 2023 S1, 14 May 2024 S2, 25 Apr 2025 S2, 16 Apr 2026 S2, 13 May 2026 S1. All 5 questions below, oldest first.

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  1. Question 1

    2 May 2023 S1

    79
    What is the total number of unpaired electrons in an element placed at period-4 and group-12 either in excited or at ground state?

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  2. Question 2

    14 May 2024 S2

    74
    Find the number of unpaired electrons for copper in ground state configuration.

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  3. Question 3

    25 Apr 2025 S2

    98
    Which of the following elements contains maximum number of unpaired electrons?

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  4. Question 4

    16 Apr 2026 S2

    2
    What is the number of unpaired electrons present in ground state of Silicon and Chromium, respectively ?

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  5. Question 5

    13 May 2026 S1

    2
    The number of unpaired electrons in Cu+2\mathrm{Cu^{+2}} and Fe+3\mathrm{Fe^{+3}} respectively are-

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