Which of these ions have six d electrons in the outermost d subshell?

Which of these ions have six d electrons in the outermost d subshell?

Os^2+

Zn^2+

Ru^2+

Tc^2+

Mn2+

Fe2+

Y^2+

Which of these ions have ten d electrons in the outmost d subshell?

Zn^2+

Tc^2+

Fe2+

Y^2+

Cd^2+

Lr^2+

Sc^2+

2 Answers

  • Look up each Wikipedia entry for each element (RH panel) and knock off the outermost (s) e⁻s to give correct charge:

    Os^2+: [Xe] 4f^14 5d^6 ✔

    Zn^2+: [Ar] 3d^10

    Ru^2+: [Kr] 4d^6 ✔

    Tc^2+: [Kr] 4d^5

    Mn2+: [Ar] 3d^5

    Fe2+: [Ar] 3d^6 ✔ (Fe, Ru, and Os are in Group 8 and all give nd^6 on loss of two e⁻s)

    Y^2+: [Kr] 4d^1

    Zn^2+: [Ar] 3d^10 ✔

    Tc^2+: [Kr] 4d^5

    Fe2+: [Ar] 3d^6

    Y^2+: [Kr] 4d^1

    Cd^2+: [Kr] 4^10 ✔

    Lr^2+: [Rn] 5f^14 6d^1 (lawrencium??)

    Sc^2+:[Ar] 3d^1

  • For those looking for the answer to: "Which of these ions have ONE d electron in the outermost d subshell?"

    The answers are:

    Sc^2+

    Y^2+

    (From Sapling Learning.)

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