Select the diamagnetic ion.?

NetherCraft 0

Cu2+

Ni2+

Cr3+

Sc3+

Cr2+

2 Answers

  • A diamagnetic atom is one that has no unpaired electrons.

    Going all the way to the 3p orbital, you have 18 electrons accounted for…

    Cu2+ has 27 electrons; so 9 electrons left.

    2 into 4s, 7 into 3d. Since 3d has 5 orbitals, 3 will be left unpaired.

    Cu2+ is not diamagnetic.

    Ni2+ has 26 electrons; so 8 electrons left.

    2 into 4s, 6 into 3d. Since 3d has 5 orbitals, 4 will be left unpaired.

    Ni2+ is not diamagnetic.

    Cr3+ has 21 electrons; so 3 electrons left.

    2 into 4s, 1 into 3d. The lone electron in 3d is unpaired.

    Cr3+ is not diamagnetic.

    Sc3+ has 18 electrons. All available orbitals are completely filled

    Sc3+ IS diamagnetic.

    And just for posterity,

    Cr2+ has 22 electrons; so 4 electrons left.

    2 into 4s, 2 into 3d. The two electrons are both unpaired.

    Cr2+ is not diamagnetic.

  • easy, just test them in the flux capacitor. whichever produces 1.21 jiggawatts is your answer.

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