Problem: The ________ ion is represented by the electron configuration [Ar]3d2.1) Co7+2) Ni7+3) Mn7+4) Sc7+5) Cu7+

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neutral atom: atomic # = # of protons


[Ar]3d2

  • Ar  18 e-
  • 3d2  2 e-

Total = 18 e- + 2 e- = 20 e-


1) Co7+

  • neutral Co  27 e-
  • +7 charge  loose 7 e-

total = 27 e- - 7 e- = 20 e-


2) Ni7+

  • neutral Ni  28
  • +7 charge  loose 7 e-

total = 28 e- - 7 e- = 21 e-


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Problem Details

The ________ ion is represented by the electron configuration [Ar]3d2.

1) Co7+

2) Ni7+

3) Mn7+

4) Sc7+

5) Cu7+

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