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
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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
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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.)