chemistry

Jan Rydberg

Jan Rydberg 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 Jan Rydberg rather than just read about it. In short: Jan Rydberg (1923–2015) was a Swedish academic who spent much of his working life at Chalmers University of Technology. He was known for his work on solvent extraction which he did while working in the Nuclear Chemistry section at Chalmers.

Key takeaways

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

Reference excerpt

Jan Rydberg (1923–2015) was a Swedish academic who spent much of his working life at Chalmers University of Technology. He was known for his work on solvent extraction which he did while working in the Nuclear Chemistry section at Chalmers.

Education He obtained his masters (MS) in Stockholm in chemistry, physics, mathematics and psychology in 1947. The topic of his thesis was "Studies of complex formation by means of a liquid-liquid distribution method." and this was defended in Stockholm in 1955, this was a thesis on the Solvent Extraction of metals using acetylacetone. His first scientific paper was on the subject of the complexes formed from thorium and acetylacetonate anions. This work was done using short-lived radioactive thorium-234 obtained from uranium-238. At the solvent extraction conference (ISEC 2008) was awarded the “Carl Hanson Award” for his outstanding contribution to solvent extraction. He was one of the founding editors of the journal Solvent Extraction and Ion Exchange, which is known as SXIX.

Career He was an early worker in partitionering and transmutation, an alternative concept to the long term deep geological disposal of either used fuel or high level waste. In P&T the alpha emitters which are the main contributors to the radiotoxicity of the waste (beyond 300 years) are removed from the liquid waste. These alpha emitters (transuranium actinides) are then destroyed (transmuted) by nuclear reactions. In 1962 he was appointed professor of nuclear chemistry at Chalmers University of Technology in 1962, and he held this chair until 1988. While at Chalmers he developed the AKUFVE experimental rig which consists of two centrifugal machines coupled together. The work on the AKUFVE resulted in the development of the SISAK experimental equipment which is used to study very short-lived radionuclides. The SISAK equipment has been used to conduct research on the chemistry of superheavy elements. In recent years it has been used to study the chemistry of the transactinides. The AKUFVE was also used by Michael Cox to study metal extraction at Warren Spring Laboratory (WSL) in Stevenage while working with Douglas Flett. The same type of experimental rig was used by Flett before to study the extraction of copper using the β hydroxybenzophenone oxime (LIX65N) with and without the addition of LIX63. Also in recent times some workers in China are also using the AKUFVE rig to study the rare earths He took part in the debate regarding the question of "should the use of nuclear power be increased or discontinued", this included an exchange of ideas which were published in the Bulletin of the Atomic Scientists. Pro-nuclear Rydberg debated with Dean Abrahamson, Wendy Barnaby, Thomas B. Johansson and Peter Steen within the pages of the bulletin. Rydberg's rebuttal discusses how slowly glass, lead and copper corrode. Abrahamson et al. reply in the same issue on page 61. Rydberg also has written a review on the risks from nuclear waste which was published by SKI (Report 96:70). SKI has now become part of SSM which is the Swedish Radiation Protection Board. Rydberg in later life was involved in the writing of two textbooks, one of which was Radiochemistry and Nuclear Chemistry (Gregory R. Choppin, Jan-Olov Liljenzin and Jan Rydberg, published in 1995). This was reviewed in Applied Radiation and Isotopes by David M. Taylor.

Personal life and death He was married to Britta E. Winroth on the 25th of October 1923, they had three daughters (Christina, Ingrid and Gunilla). He died in 2015 of heart failure but he had lived for years with prostate cancer. After his death, a recycling prize at Chalmers was named after him.

Awards and honors Commander of the Order of the Polar Star Membership of the Royal Swedish Academy of Engineering Sciences Membership of the Royal Society of Arts and Sciences in Gothenburg The Carl Hanson Medal

Positions held Chairman of the Swedish Chemical Society Dean of Chemistry at CTH, Gothenburg (1980–1982). Director of MEAB (1970–1981), MEAB is a company which markets solvent extraction machines for industrial and research use.

References

Illustrations

Jan Rydberg: Jan Rydberg in 1973 — Jan Rydberg in 1973

Worked examples

Example 1 — a first encounter with Jan Rydberg

Start with the simplest possible case. Write down what Jan Rydberg 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 Jan Rydberg 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 Jan Rydberg 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 Jan Rydberg

In research: Jan Rydberg 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 Jan Rydberg 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: Jan Rydberg is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1923 births, 2015 deaths, Swedish chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Jan Rydberg 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 Jan Rydberg in 20 minutes

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

Frequently asked questions

What is Jan Rydberg in simple terms?

Why does Jan Rydberg 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 Jan Rydberg?

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 Jan Rydberg.