chemistry

Isotopes of europium

Isotopes of europium 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 Isotopes of europium rather than just read about it. In short: Naturally occurring europium (63Eu) is composed of two isotopes, 151Eu and 153Eu, with 153Eu being the more abundant (52.2% natural abundance). While 153Eu is observationally stable, 151Eu was found in 2007 to be unstable and undergo alpha decay; its measured half-life of 4.6 × 1018 years corresponds to 1 alpha decay per two minutes per kilogram of natural europium, so for practical purposes it can be considered sta…

Key takeaways

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

Reference excerpt

Naturally occurring europium (63Eu) is composed of two isotopes, 151Eu and 153Eu, with 153Eu being the more abundant (52.2% natural abundance). While 153Eu is observationally stable, 151Eu was found in 2007 to be unstable and undergo alpha decay; its measured half-life of 4.6 × 1018 years corresponds to 1 alpha decay per two minutes per kilogram of natural europium, so for practical purposes it can be considered stable. Besides the natural radioisotope 151Eu, artificial radioisotopes from 130Eu to 170Eu have been made, with the most stable being 150Eu with a half-life of 36.9 years, 152Eu with a half-life of 13.517 years, 154Eu with a half-life of 8.592 years, and 155Eu with a half-life of 4.742 years. All the others have half-lives shorter than 100 days, with the majority shorter than 3 minutes. This element also has 27 metastable isomers, with the most stable being 150mEu (12.8 hours), 152m1Eu (9.3116 hours) and 152m5Eu (96 minutes). The primary decay mode for isotopes lighter than 153Eu is electron capture to samarium isotopes, and the primary mode for heavier isotopes is beta minus decay to gadolinium isotopes. 152Eu and 154Eu can decay either way, as can 150mEu (meta state only).

List of isotopes

Europium-155

Europium-155 is a fission product with a half-life of 4.742 years and has a maximum decay energy of 252 keV. Because of its position on the high-mass end of the yield curve, it has a low fission product yield, about 1 to 2% that of the most abundant fission products. 155Eu's large neutron capture cross section means that most of the small amount produced is destroyed in the course of the nuclear fuel's burnup. Yield, decay energy, and half-life are all far less than that of 137Cs and 90Sr, so 155Eu is not a significant contributor to nuclear waste. Some 155Eu is also produced by successive neutron captures on 153Eu and 154Eu, whose direct fission yield is extremely small as its mass chain stops at 154Sm. However, the high cross sections, and even higher for 155 than 154, mean that both 155Eu and 154Eu are destroyed faster than they are produced. See the table below for numeric details on this process.

See also Daughter products other than europium

Isotopes of gadolinium Isotopes of samarium Isotopes of promethium

References

Worked examples

Example 1 — a first encounter with Isotopes of europium

Start with the simplest possible case. Write down what Isotopes of europium 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 Isotopes of europium 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 Isotopes of europium 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 Isotopes of europium

In research: Isotopes of europium 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 Isotopes of europium 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: Isotopes of europium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Europium, Isotopes of europium, Lists of isotopes by element, so understanding it makes those chapters shorter.
In everyday life: Look for Isotopes of europium 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 Isotopes of europium in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Isotopes of europium 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 Isotopes of europium out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Isotopes of europium in simple terms?

Why does Isotopes of europium 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 Isotopes of europium?

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 Isotopes of europium.