Which of the following diatomic species are paramagnetic and which are diamagnetic?

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Which of the following diatomic species are paramagnetic and which are diamagnetic?

1) Be2(2-)

2)C2(-1)

3)Be2(4-)

1 Answer

  • Paramagnetism….

    A substance is paramagnetic when it has one or more unpaired electrons. It is attracted to a magnetic field. A diamagnetic substance, where are the electrons are paired, is weakly repelled by a magnetic field. A ferromagnetic material can support its own permanent magnetic field. Examples are iron, cobalt, nickel and some rare-earth metals and alloys.

    Crank out the molecular orbital diagrams

    Be2 (neutral) …. bond order is zero …. zero unpaired electrons …. diamagnetic

    ……….__

    ……..__ __

    2p………………2p

    ……….__

    ……..↑_ ↑_

    ………..↑↓

    2s ↑↓ ……. ↑↓ 2s

    ………..↑↓

    Be2^2- ………….. bond order is 1 …. two unpaired electrons …. paramagnetic

    ………__

    …….__ __

    2p…………….2p

    ……….__

    ……..↑↓ ↑↓

    ………..↑↓

    2s ↑↓ ……. ↑↓ 2s

    ………..↑↓

    Be2^4- ………….. bond order is 2 …. zero unpaired electrons …. diamagnetic

    ============

    C2 (neutral) …… bond order is 2 …. zero unpaired electrons …. diamagnetic

    ……….__

    ……..__ __

    2p……………..2p

    ………..↑_

    ……..↑↓ ↑↓

    ………..↑↓

    2s ↑↓ ……. ↑↓ 2s

    ………..↑↓

    C2^- …………… bond order is 2.5 …. one unpaired electron …. paramagnetic

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