(b) Magnesium iodide can be made by reacting magnesium with iodine. Mg + I2 → MgI2 Magnesium iodide is an ionic compound. It contains magnesium ions (Mg 2+ ) and iodide ions (I -). Describe, in terms of electrons, what happens when magnesium reacts with iodine.
Question
(b) Magnesium iodide can be made by reacting magnesium with iodine. Mg + I2 → MgI2 Magnesium iodide is an ionic compound. It contains magnesium ions (Mg 2+ ) and iodide ions (I -). Describe, in terms of electrons, what happens when magnesium reacts with iodine.
Solution
When magnesium reacts with iodine to form magnesium iodide, an electron transfer occurs.
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Magnesium (Mg) has two electrons in its outermost shell. To achieve a stable electron configuration, it tends to lose these two electrons. When it does so, it becomes a magnesium ion (Mg2+) with a 2+ charge.
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Iodine (I2), on the other hand, needs one electron to complete its outermost shell and achieve a stable electron configuration. However, since it's diatomic (exists as I2), it needs two electrons - one for each iodine atom.
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When magnesium reacts with iodine, it donates its two outermost electrons - one to each iodine atom. This results in the formation of two iodide ions (I-), each with a 1- charge.
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The magnesium ion (Mg2+) and the two iodide ions (I-) then attract each other due to their opposite charges, forming the ionic compound magnesium iodide (MgI2).
So, in terms of electrons, magnesium loses two electrons and iodine gains these two electrons when magnesium reacts with iodine to form magnesium iodide.
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