chemistry

Coronium

Coronium 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 Coronium rather than just read about it. In short: Coronium was the name of a suggested chemical element that was hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887.

Key takeaways

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

Reference excerpt

Coronium was the name of a suggested chemical element that was hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887. A new atomic thin green line in the solar corona was then considered to be emitted by a new element unlike anything else seen under laboratory conditions. It was later determined to be emitted by iron (Fe13+), so highly ionized that it was at that time impossible to produce in a laboratory.

Solar spectroscopy During the total solar eclipse of 7 August 1869, a green emission line of wavelength 530.3 nm was independently observed by Charles Augustus Young (1834–1908) and William Harkness (1837–1903) in the coronal spectrum. Since this line did not correspond to that of any known material, it was proposed that it was due to an unknown element, provisionally named coronium. The supposed element was allegedly discovered also in the gases given off by Mount Vesuvius in 1898 by a team of Italian chemists led by Raffaello Nasini. Nasini had no photographic record of the spectrum, and the observation was considered unconfirmed. In 1902, over thirty years after his famous predictions of new elements based on his periodic table, and shortly after the discovery of various noble gases, the Russian chemist Dmitri Mendeleev hypothesized that there existed two noble gases of atomic weight less than hydrogen. The first, which he called "element x" or "newtonium", was his attempt at a chemical explanation of the luminiferous aether. He argued that it had an atomic weight of 0.14. The second, which he called "element y" or coronium, was his attempt to explain the green emission lines from the Sun. He argued that it had an atomic weight of 0.4. It was not until the 1930s that Walter Grotrian and Bengt Edlén discovered that the spectral line at 530.3 nm was due to highly ionized iron (Fe13+); other unusual lines in the coronal spectrum were also caused by highly charged ions, such as nickel, the high ionization being due to the extreme temperature of the solar corona. The line at 530.3 nm had previously been misclassified as iron line number 1474.

Illustrations

Worked examples

Example 1 — a first encounter with Coronium

Start with the simplest possible case. Write down what Coronium 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 Coronium 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 Coronium 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 Coronium

In research: Coronium 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 Coronium 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: Coronium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Iron, Misidentified chemical elements, so understanding it makes those chapters shorter.
In everyday life: Look for Coronium 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 Coronium in 20 minutes

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

Frequently asked questions

What is Coronium in simple terms?

Coronium was the name of a suggested chemical element that was hypothesised in the 19th century. The name, inspired by the solar corona, was given by Gruenwald in 1887.

Why does Coronium 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 Coronium?

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 Coronium.