What Is Polonium Definition Atomic Structure Radioactivity Isotopes and Uses
What is Polonium?
It is an element with the chemical symbol Po and atomic number 84 in the periodic table. Polonium is in Group 16 and period 6 in the periodic table of elements. It is a rare natural element and highly radioactive metal with no stable isotopes, It was discovered in 1898 by Marie Sklodowska Curie and Pierre Curie. It is extremely toxic even in small amounts and is termed as perfect poison.
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Properties of Polonium
Certain Facts About Polonium
Its chemical property is similar to bismuth and tellurium. (Polonium is the heaviest metal of the chalcogens, also known as the "oxygen family.")
It has no stable isotopes. (Po-210 has a half-life of only 138 days).
It is a radioactive semi-metal found in uranium ores. It is used in some devices to eliminate static electricity in processes such as manufacturing sheet plastic, rolling paper, etc.
manufacturing sheet plastics, and spinning synthetic fibers.
It emits alpha-particles after the disintegration.
It is classified as a metal because polonium electrical conductivity decreases as its temperature increases.
If polonium-210 enters inside the body, through inhalation or swallowing, the results can be fatal.
Tobacco smokers have more polonium-210 content compared to nonsmokers because smoking causes it to accumulates in the lungs.
Did You Know?
Uranium and thorium were the only known radioactive elements before Polish-French physicist, Marie Curie discovered polonium in the year 1898. Curie named polonium after her homeland, Poland. Poland was not an independent country at that time and was ruled by German, Russian, and Austro-Hungarian partition. With the hope of naming the element after her native land Madam Curie did so to publicize its lack of independence, Polonium was the first-ever element to be named highlighting a political controversy.
FAQs on Polonium Element Overview Properties Isotopes and Applications
1. What is polonium?
Polonium is a highly radioactive chemical element with the symbol Po and atomic number 84. It belongs to Group 16 (chalcogens) of the periodic table and is classified as a post-transition metal.
- Discovered in 1898 by Marie and Pierre Curie.
- Named after Poland ("Polonia").
- All isotopes of polonium are radioactive.
- Common isotope: Po-210, an alpha emitter.
2. What is the electron configuration of polonium?
The electron configuration of polonium (Z = 84) is [Xe] 4f14 5d10 6s2 6p4.
- It has six valence electrons in the 6s and 6p orbitals.
- Belongs to the p-block of the periodic table.
- Valence shell configuration: 6s26p4, similar to oxygen, sulfur, and tellurium.
3. What are the common oxidation states of polonium?
The most common oxidation states of polonium are +2 and +4.
- +2 state: more stable due to the inert pair effect.
- +4 state: forms compounds like PoCl4.
- Higher oxidation states are less stable compared to lighter chalcogens.
4. Why is polonium so radioactive?
Polonium is highly radioactive because all its isotopes have unstable nuclei that undergo radioactive decay.
- It has no stable isotopes.
- Po-210 decays by alpha emission to form lead-206.
- Example nuclear decay: 210Po → 206Pb + 4He.
5. How is polonium produced?
Polonium is mainly produced artificially by neutron irradiation of bismuth-209 in a nuclear reactor.
- Nuclear reaction: 209Bi + 1n → 210Bi
- 210Bi undergoes beta decay to form 210Po.
- This method produces Po-210 for industrial and research use.
6. What are the chemical properties of polonium?
Polonium is a reactive chalcogen that forms oxides, halides, and hydrides, showing metallic and nonmetallic behavior.
- Reacts with oxygen to form PoO2.
- Forms halides such as PoCl2 and PoCl4.
- Shows metallic conductivity compared to lighter Group 16 elements.
7. What are the uses of polonium?
Polonium-210 is used primarily as an alpha particle source in scientific and industrial applications.
- Used in anti-static devices to remove static electricity.
- Acts as a heat source in space equipment.
- Used in research as a compact radioactive source.
8. Is polonium toxic to humans?
Yes, polonium is extremely toxic because it emits highly damaging alpha radiation inside the body.
- Alpha particles cause severe cellular damage when ingested or inhaled.
- Very small amounts of Po-210 can be lethal.
- External exposure is less dangerous than internal contamination.
9. How does polonium compare to other Group 16 elements?
Polonium differs from lighter Group 16 elements by being metallic and highly radioactive.
- Oxygen and sulfur are nonmetals.
- Tellurium is a metalloid.
- Polonium behaves more like a metal and shows stronger inert pair effect.
10. What type of decay does polonium-210 undergo?
Polonium-210 undergoes alpha decay, emitting a helium nucleus (4He).
- Balanced nuclear equation: 210Po → 206Pb + 4He.
- Half-life of Po-210 is about 138 days.
- Alpha decay reduces atomic number by 2 and mass number by 4.
