Difference Between Uranium and Thorium

Main Difference – Uranium vs Thorium

Uranium and Thorium are well known radioactive elements that can be found in nature in significant amounts. They belong to the actinide series of the f block of the periodic table. Both Uranium and Thorium are weakly radioactive elements and are composed of a number of radioactive isotopes. Since they are weakly radioactive, some isotopes of Uranium and Thorium have different applications. These chemical elements may also be hazardous due to their radioactivity. The main difference between Uranium and Thorium is that Uranium has a naturally occurring fissile isotope whereas Thorium has no fissile isotopes.

Key Areas Covered

1. What is Uranium
     
– Definition, Radioactivity, Isotopes, Applications
2. What is Thorium
     
– Definition, Radioactivity, Isotopes, Applications
3. What are the Similarities Between Uranium and Thorium
     
– Outline of Common Features
4. What is the Difference Between Uranium and Thorium
      – Comparison of Key Differences

Key Terms: Fissile Material, Isotope, Radioactive Decay, Radioactivity, Thorium, Uranium

Difference Between Uranium and Thorium - Comparison Summary

What is Uranium

Uranium is a radioactive chemical element that has the atomic number 92 and the symbol U. Uranium belongs to the group of actinides in the periodic table of elements. It is in the f block of the periodic table. The atomic weight of the most stable and abundant isotope of Uranium is about 238.02 amu. The electron configuration of Uranium can be given as [Rn]5f36d17s2.

At room temperature and pressure, Uranium is a solid metal. The melting point of Uranium is about 1132oC. The boiling point is about 4130oC. Uranium can have a few stable positive oxidation states since Uranium has 6 valence electrons.

There are several isotopes of Uranium. The most abundant isotope is Uranium-238. (The abundance is about 99%). Uranium-235 and Uranium-234 can also be found in nature. But they are present in trace amounts. Uranium-235 is very important among these isotopes since it is the only fissile isotope that is naturally occurring. Thus, Uranium is widely used in nuclear power plants and nuclear weapons.

Figure 1: Model of Uranium 235 Atom

Figure 1: Model of Uranium 235 Atom

Uranium-238 is called a fertile material since this element itself it is not fissile but can be made into an isotope that can sustain a chain reaction by some other method such as bombardment with a high-speed neutron.

Main Difference - Uranium vs Thorium

Figure 2: Some Reactions of Uranium Oxides

Uranium element can form oxides. The salts of Uranium are water soluble. They may give different colors in aqueous solutions according to their oxidation states. Furthermore, Uranium can form halides such as UF4 and UF6. These fluorides are formed when Uranium metal reacts with HF (hydrogen fluoride) or F2 (Fluorine gas).

What is Thorium

Thorium is a radioactive chemical element that has the atomic number 90 and the symbol Th. Thorium belongs to the actinide series of the f block in the periodic table of elements. It is in solid state at room temperature and pressure. The electronic configuration of Thorium is [Rn]6d27s2. The atomic weight of the most stable and abundant isotope of Thorium is about 232.038 amu.

Difference Between Uranium and Thorium_Figure 3

Figure 3: Chemical Structure of Thorium Atom

The melting point of Thorium is about 1750oC and the boiling point is about 4785oC. The most common oxidation state of Thorium is 4 since the number of valence electrons in Thorium is 4. But there can also be other oxidation states such as +3, +2 and +1. These are weak basic compounds.

Thorium has a number of isotopes. But the most stable and abundant isotope is Thorium-232. (The abundance is about 99%). Other isotopes are found in very trace amounts. Thorium is highly reactive and can form different compounds. Thorium can involve in the formation of inorganic and coordination compounds.

Since Thorium is more abundant than Uranium, Thorium can be used as an alternative for Uranium in nuclear power plants. However, Thorium is hazardous due to its radioactivity. But Thorium slowly decays and it tends to emit alpha radiation. Therefore, the exposure to Thorium for a short time may not cause any risk (because the alpha radiation cannot penetrate through our skin).

Similarities Between Uranium and Thorium

  • Uranium and Thorium are radioactive elements.
  • Both elements undergo alpha decay slowly.
  • Both elements are in the actinide series of the f block of the periodic table of elements.
  • Both elements have naturally occurring isotopes.
  • Both chemical elements are used in nuclear power plants and nuclear weapons.

Difference Between Uranium and Thorium

Definition

Uranium: Uranium is a radioactive chemical element that has the atomic number 92 and the symbol U.

Thorium: Thorium is a radioactive chemical element that has the atomic number 90 and the symbol Th.

Melting Point and Boiling Point

Uranium: The melting point of Uranium is about 1132oC. The boiling point is about 4130oC.

Thorium: The melting point of Thorium is about 1750oC. The boiling point is about 4785oC.

Isotopes

Uranium: Uranium has several isotopes including a naturally occurring fissile isotope.

Thorium: Thorium has several isotopes but there are no naturally occurring fissile isotopes.

Number of Valence Electrons

Uranium: Uranium has 6 valence electrons.

Thorium: Thorium has 4 valence electrons.

Abundance

Uranium: Uranium is less abundant than Thorium.

Thorium: Thorium is more abundant than Uranium.

Conclusion

Uranium and Thorium are two of the three elements that can undergo radioactive decay significantly and are found in large amounts in nature comparatively. However, these are hazardous elements that can cause different diseases in our body due to their radioactivity. But exposure to a small quantity for a very short time period may not be that harmful since these elements tends to undergo alpha decay and decay occurs very slowly.

References:

1. “Thorium – Element information, properties and uses | Periodic Table.” Royal Society of Chemistry, . Accessed 4 Sept. 2017.
2. “Uranium.” Wikipedia, Wikimedia Foundation, 31 Aug. 2017, . Accessed 4 Sept. 2017.
3. Kirk Sorensen, Chief Technologist, Flibe Energy | Sep 28, 2016. “What’s the Difference Between Thorium and Uranium Nuclear Reactors?” Machine Design, 10 Oct. 2016, . Accessed 4 Sept. 2017.

Image Courtesy:

1. “U-235″ By Stefan-Xp – Own work via
2. “Uranium-trioxide-formation” By InXtremis – Own work via
3. “1802359” (Public Domain) via

About the Author: Madhusha

Madhusha is a BSc (Hons) graduate in the field of Biological Sciences and is currently pursuing for her Masters in Industrial and Environmental Chemistry. Her interest areas for writing and research include Biochemistry and Environmental Chemistry.

Leave a Comment


Related pages


what is the difference between a river and a canaltypes of sensory imagerydefine enjambment in poetrydefine megaloblasticdouble entendre definitioncalzone stromboli differencedifference brandy cognacadverb and typestesting for sulphate ionsdifference between a gene and alleleomnivore teethdominant vs recessive allelesdifference between digestive system of herbivores and carnivoresdifference between starch and cellulosemild steel vs stainless steel strengthwhat is difference between motel and hoteldefinition aliphaticwhat is encultration2d echo preparationenglish mastiff vs bullmastiffwhat is the difference between a vowel and a consonantdifference ceramic porcelainthermoset plastics examplesmultidomestic corporationswhat is the difference between prejudice and discriminationphysical properties of alkanes and alkenesdifference between subject and predicateboiling point definedefinition of beta pleated sheetcalzone stromboli differencedefinition blastocystdifference between polymer and copolymerindian flag colour stands for7star hotelattenuation definition physicswhat is the major structural difference between starch and glycogendifference between a ged and high school diplomadifference between waiting and awaiting meaningidioms and phrases with hindi meanings and examples pdfdefinition of protagonist and antagonistdefinition of couscousparallelism literaturewhat are polar and nonpolar moleculesdefinition of meristembmr vs rmrsugarpaste vs fondantwhat are some differences between prokaryotic and eukaryotic cellsboiling point of petroleum ethermolecular structure of maltosesingle celled and multicellular organisms differenceswhat is the difference between a hurricane and typhoonamorphous vs crystallinefunction of cotyledon5 examples of concrete nounsdefinition of modern periodic lawdifference between electrostatics and electrodynamicsbivalent tetradwhat is the difference between schizophrenia and bipolardifference between cyclic and non cyclic photophosphorylationfennel seeds in tamil namewhat is a nonvolatile substancecompressive strength and tensile strengthhenry clay's american systempeasants in feudalismwhat is the difference between sexual and asexual reproductiondissociative identity disorder vs schizophreniawhat are the physical properties of alkanesexamples of abstract and concrete nounsdifference between md and mbbs doctordifference between avenge and revengehuskies malamuteexamples of indefinite pronouns singular and pluralrelays and circuit breakerscollenchyma and parenchyma