What is Americium Definition Properties Isotopes and Uses in Nuclear Chemistry
From the discovery of ‘Glenn Seaborg’ and colleagues, Americium (Am) with its atomic number 95, is known for 2 key things: Absence of Isotopes and regarded as an actinide which is made-made. From being a substitute to Plutonium in 1 area to acting as a decay product in another, Americium uses are only a few but important ones. Possessing certain physical and chemical properties quite different from the rest of its actinide elements, we are about to learn about the Definition, properties, some interesting facts and Americium (Am) uses with a detailed overview.
Basic Things to Know about Americium
Americium is an actinide created by humans and is located in the 7th row in the f-block of the periodic table. There are a total of 15 actinide elements in the periodic table and Americium (Am) is 1 among the group, starting with Actinium. The credits for the discovery goes to the research members from the “University of California” namely Glenn Seaborg, Albert Ghiorso, Ralph James, and Leon Morgan, at a major site assigned by the US Government for wartime resource development.
Moreover, the naming itself has an interesting fact associated with it. ‘Americium’ was the term labelled for this man-made chemical element in the stance of giving honours to the American Continent. This nomenclature was specifically chosen since this newly created compound is present below the Europium (that is Europe) in the periodic chart.
The element was found in 1944 as the by-product in military research during the times of World War II (1939-45). This was then isolated in the Fall of 1945 by B.B. Cunningham. The isolated component is termed isotope 241Am with Am(OH)3.
As we now grasped the basic details about Americium (Am), let us move further to the important sections of properties.
The Physical Properties of Americium
White-coloured Silvery metal.
Sufficient amounts of Americium element was needed to at least study the details about its main properties.
Present as solid at 20°C.
The Pronunciation of this element is [am-uh-REE-see-um].
Only 1 isotope is noted to have applications outside a clinical laboratory.
Americium belongs to the Transuranium (the literal meaning is “beyond uranium” and the atomic number should be more than 92) elements.
It is not probable to find Transuranium chemical compounds in the natural environment. They are majorly formed using synthetic materials and processes only. So, the extraction of Americium is absent here.
Listing out Americium’s Chemical Properties
The symbol is [Am].
The atomic number is 95.
[Rn] 5f77s2 is the Electronic Configuration.
2011°C at 3652°F with a temperature of 2284 K is the boiling point of Am.
The melting point is 1,175°C at 2,150°F.
13.6 grams per cubic centimetre is the density of Americium.
The Relative Atomic Mass is found to be 243.0614 g.mol -1.
A Gist About the Isotopes of Americium
Every isotope of Americium is said to be highly radioactive, out of which, americium-241 is the most resolute one. It is estimated that 432.7 years is the approximate half-life of americium-241.
That is if a clinic has created 9.4 grams of americium-241, then by the end of 432.7 years, the next set of people will witness only half the amount present in its compound. The remaining half will be converted into a new chemical element.
Real-Life Americium Uses
As we read before, only 1 isotope, that is ‘Am-241’ has practical Americium uses outside the clinical setup. Since both alpha and gamma rays are exhibited from this isotope, it makes americium-241 possible to use it in portable X-ray machines. This also has practical usages in the field of underground mining and oil well drilling since it helps in finding the location as to where to dig the new wells.
For newly made glass materials, a minimal amount of Americium can be placed over the conveyor belt carrying the object. So, the Geiger counter is used to count the alpha radiation-exposed is kept below the belt on the line. By doing this, measuring the thickness of specific things and entities is possible. 3 interpretations are possible using americium-241 and the Geiger counter as given below:
If the radiation is less detected, then the glass object is thicker than usual.
If the radiation is more, the glass is quite thinner than regular ones.
If the glass material is of the usual or same thickness, then the trapped radiation and the thickness of the object will both be equal when observed from the detector.
In the production of spacecraft batteries, Americium is the key substitute when Plutonium is absent or minimally available.
Americium is even found in household ionization smoke-detectors. The element takes an important role inside smoke detectors, in the combination of americium oxide and americium-241. Alpha particles created here will strike the air molecules and thus, makes them break and form electrically-charged ionic particles. These entities are carrying current from 1 side to another and the electricity is passed as long as the presence of air. The buzzer sound comes out only if the alpha charges interrupt the flow of electrical ions.
As an interesting add-on to the stated, having as low as 1 gram of the combination of Americium Oxide and americium-241, can be effective in manufacturing 5000 different smoke detectors!
Americium is also used as a decay product in several nuclear power production systems.
On a precautionary side, Americium is a highly toxic substance. Swallowing Americium even accidentally will lead to the deposition of this element in the human bones. Radiation spread from here kills the body’s healthy cells and triggers issues such as cancer and other major forms of melanoma. However, smoke detectors using Americium is not a crucial danger to humans.
Conclusion
Americium is a man-made silver, shiny, chemical compound, classified under the transuranium elements and actinides in the f-block of the periodic table. Located in the 7th row, Americium’s atomic number is 95 and is not found naturally in the surrounding environment. B.B. Cunningham isolated the element and was discovered by Glenn Seaborg with 4 other research members during World War II. Americium was named for the element to denote the continent of America, lying below the Europium in the periodic table. Americium has only 1 major isotope, americium-214 that has a good number of applications beyond a lab. Replacement for spacecraft batteries, ionization smoke detectors, Decay product for nuclear reactors.
FAQs on Americium Element Overview Structure and Applications
1. What is americium?
Americium is a synthetic radioactive element with atomic number 95 and the chemical symbol Am, belonging to the actinide series.
- It is a silvery-white metal produced artificially in nuclear reactors.
- Americium is not found naturally in significant amounts on Earth.
- It was first synthesized in 1944 by bombarding plutonium with neutrons.
- All isotopes of americium are radioactive.
2. What is the atomic number and electron configuration of americium?
Americium has atomic number 95 and the ground-state electron configuration [Rn] 5f7 7s2.
- It contains 95 protons and 95 electrons in a neutral atom.
- The valence electrons are mainly in the 5f and 7s orbitals.
- Its position in the actinide series explains its similar behavior to other f-block elements.
3. What are the common oxidation states of americium?
The most common oxidation state of americium is +3, although +2, +4, +5, and +6 are also possible.
- Am3+ is the most stable and common ion in aqueous solutions.
- Higher oxidation states such as +5 and +6 occur in oxo-cations like AmO2+ and AmO22+.
- The +2 state is less stable and usually observed under reducing conditions.
4. How is americium produced?
Americium is produced by neutron bombardment of plutonium in nuclear reactors followed by beta decay.
- For example, 239Pu absorbs a neutron to form 240Pu.
- Further neutron capture and beta decay lead to 241Am.
- The simplified process involves neutron capture (n,γ) reactions and subsequent β− decay.
5. What is americium-241 used for?
Americium-241 (241Am) is primarily used in ionization smoke detectors and industrial gauges.
- It emits alpha (α) particles that ionize air inside the detector.
- The ionized air allows a small electric current to flow.
- When smoke enters, it disrupts the current, triggering the alarm.
6. Why is americium radioactive?
Americium is radioactive because its nuclei are unstable and undergo spontaneous nuclear decay to reach more stable configurations.
- Most isotopes emit alpha (α) particles.
- For example, 241Am → 237Np + 4He.
- This alpha decay reduces the atomic number by 2 and the mass number by 4.
7. What is the half-life of americium-241?
The half-life of americium-241 is approximately 432.2 years.
- Half-life is the time required for half of a radioactive sample to decay.
- This relatively long half-life makes 241Am suitable for long-term devices like smoke detectors.
- It decays mainly by alpha emission to 237Np.
8. Where is americium found?
Americium is not found naturally in significant amounts and is mainly produced in nuclear reactors as a byproduct of plutonium reactions.
- It forms during neutron capture processes in uranium and plutonium fuel.
- Trace amounts may exist in nuclear fallout.
- It is extracted from spent nuclear fuel through chemical separation techniques.
9. What are the physical and chemical properties of americium?
Americium is a silvery-white radioactive metal with typical actinide chemical behavior and a dominant +3 oxidation state.
- Atomic number: 95
- Block: f-block (actinide series)
- Common ion: Am3+
- It reacts with oxygen to form oxides such as AmO2.
10. Is americium dangerous to humans?
Americium is dangerous if inhaled or ingested because it emits alpha radiation that can damage living tissue.
- Alpha particles cannot penetrate skin easily.
- However, internal exposure can cause significant biological harm.
- In controlled devices like smoke detectors, the radiation level is extremely low and shielded.
