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29 June, 08:27

How many of the following species are paramagnetic? sc3 + br - mg2 + se?

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  1. 29 June, 08:37
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    One: Selenium is Paramagnetic

    Explanation:

    Those compounds which have unpaired electrons are attracted towards magnet. This property is called as paramagnetism. Lets see why remaining are not paramagnetic.

    Electronic configuration of Scandium;

    Sc = 21 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹

    Sc³⁺ = 1s², 2s², 2p⁶, 3s², 3p⁶

    Hence in Sc³⁺ there is no unpaired electron.

    Electronic configuration of Bromine;

    Br = 35 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁵

    Br⁻ = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶

    Hence in Br⁻ there is no unpaired electron.

    Electronic configuration of Magnesium;

    Mg = 12 = 1s², 2s², 2p⁶, 3s²

    Mg²⁺ = 1s², 2s², 2p⁶

    Hence in Mg²⁺ there is no unpaired electron.

    Electronic configuration of selenium;

    Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁴

    Or,

    Se = 34 = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4px², 4py¹, 4pz¹

    Hence in Se there are two unpaired electrons hence it is paramagnetic in nature.
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