chemistry

Gadolinium diiodide

Gadolinium diiodide is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Gadolinium diiodide rather than just read about it. In short: Gadolinium diiodide is an inorganic compound, with the chemical formula of GdI2. It is an electride, with the ionic formula of Gd3+(I−)2e−, and therefore not a true gadolinium(II) compound.

Key takeaways

Gadolinium diiodide belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Gadolinium diiodide to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Gadolinium diiodide from memory before moving on to harder problems.

Reference excerpt

Gadolinium diiodide is an inorganic compound, with the chemical formula of GdI2. It is an electride, with the ionic formula of Gd3+(I−)2e−, and therefore not a true gadolinium(II) compound. It is ferromagnetic at 276 K with a saturation magnetization of 7.3 B; it exhibits a large negative magnetoresistance (~70%) at 7 T near room temperature. It can be obtained by reacting gadolinium and gadolinium(III) iodide at a high temperature:

Gd + 2 GdI3 → 3 GdI2 It can react with hydrogen at high temperature (800 °C) to obtain gadolinium hydrogen iodide (GdI2H0.97).

References

Illustrations

Worked examples

Example 1 — a first encounter with Gadolinium diiodide

Start with the simplest possible case. Write down what Gadolinium diiodide claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Gadolinium diiodide before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Gadolinium diiodide ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Gadolinium diiodide

In research: Gadolinium diiodide appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Gadolinium diiodide in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Gadolinium diiodide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electrides, Ferromagnetic materials, Gadolinium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Gadolinium diiodide outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Gadolinium diiodide in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Gadolinium diiodide means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Gadolinium diiodide out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Gadolinium diiodide in simple terms?

Gadolinium diiodide is an inorganic compound, with the chemical formula of GdI2. It is an electride, with the ionic formula of Gd3+(I−)2e−, and therefore not a true gadolinium(II) compound.

Why does Gadolinium diiodide matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Gadolinium diiodide?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Gadolinium diiodide.