chemistry

Isotopes of bismuth

Isotopes of bismuth 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 bismuth rather than just read about it. In short: Bismuth (83Bi) has 41 known isotopes, ranging from 184Bi to 224Bi. Bismuth has no stable isotopes, but does have one naturally occurring, very long-lived isotope; thus, the standard atomic weight can be given from that isotope, bismuth-209.

Key takeaways

Isotopes of bismuth 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 bismuth to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Isotopes of bismuth from memory before moving on to harder problems.

Reference excerpt

Bismuth (83Bi) has 41 known isotopes, ranging from 184Bi to 224Bi. Bismuth has no stable isotopes, but does have one naturally occurring, very long-lived isotope; thus, the standard atomic weight can be given from that isotope, bismuth-209. Though it is now known to be radioactive, it may still be considered practically stable because it has a half-life of 2.01×1019 years, which is more than a billion times the age of the universe. Besides 209Bi, the most stable bismuth radioisotopes are 210mBi with a half-life of 3.04 million years, 208Bi with a half-life of 368,000 years and 207Bi, with a half-life of 31.22 years, none of which occur in nature. All other isotopes have half-lives under 15 days, most under two hours. Of naturally occurring radioisotopes, the most stable is radiogenic 210Bi with a half-life of 5.012 days. 210mBi is unusual for being a nuclear isomer with a half-life many orders of magnitude longer than that of the ground state.

List of isotopes

Bismuth-213 Bismuth-213 (213Bi) has a half-life of 45.6 minutes and decays mainly by beta emission to polonium-213; with only 2.1% going via alpha emission to thallium-209; however, as the polonium instantly decays by alpha, one alpha particle is emitted per atom. The amounts needed for medical use are always produced through its decay chain (the neptunium series) from either thorium-229 (limited supply due to the long life of that isotope) or actinium-225, which can be produced directly from radium-226, for example by bombardment with bremsstrahlung photons from a linear particle accelerator, knocking out a neutron and through beta decay giving actinium-225. In 1997, an antibody conjugate with 213Bi was used to treat patients with leukemia, and this isotope has otherwise been used in targeted alpha therapy (TAT) to treat a variety of cancers. Bismuth-213 is also produced in the decay of uranium-233, the fuel bred by thorium reactors, but as mentioned this goes through the long-lived thorium-229, so the production rates from each reactor will not be large.

See also Daughter products other than bismuth

Isotopes of polonium Isotopes of lead Isotopes of thallium

References

Worked examples

Example 1 — a first encounter with Isotopes of bismuth

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

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

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Isotopes of bismuth in 20 minutes

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

Frequently asked questions

What is Isotopes of bismuth in simple terms?

Why does Isotopes of bismuth 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 bismuth?

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 bismuth.