Question Video: Identifying Ferromagnetic Ions | Nagwa Question Video: Identifying Ferromagnetic Ions | Nagwa

Question Video: Identifying Ferromagnetic Ions Chemistry • Third Year of Secondary School

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Which of the following is ferromagnetic? [A] Mn²⁺ [B] Cu²⁺ [C] Ti²⁺ [D] V³⁺ [E] Fe²⁺

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Video Transcript

Which of the following is ferromagnetic? (A) Mn2+, (B) Cu2+, (C) Ti2+, (D) V3+, (E) Fe2+.

First of all, a substance is considered ferromagnetic if it is able to form a permanent magnet. There are not that many ferromagnetic elements. Let’s take a look at the magnetic properties of the period four d-block metals.

Several of these metals are paramagnetic, which means they are attracted to the magnetic fields of other magnets but are not permanently magnetic. Paramagnetic substances have unpaired electrons in their orbitals. We also notice that copper and zinc are diamagnetic, which means they weakly repel other magnets but are not permanent magnets.

Diamagnetic substances generally have only paired electrons in their orbitals. When looking at the electronic configuration of copper, we might expect it to be paramagnetic because there is one unpaired electron in the 4s subshell. However, it turns out that copper is an exception to this rule and is diamagnetic.

Because of their unique structures, iron, cobalt, and nickel elements and most of their alloys exhibit ferromagnetism. This means these elements are permanently magnetic, and not just magnetic when they interact with other magnets.

Finally, we see that chromium is antiferromagnetic, which is a type of magnetism we won’t discuss in this video.

When looking at the answer choices, the ion that is most likely to be ferromagnetic is the iron(II) ion. However, it’s important to note that iron(II) ions are not ferromagnetic in all of the substances that they are found in. Therefore, the correct answer is answer choice (E), Fe2+.

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