Actinium and the actinides, Chemistry

Assignment Help:

 

ACTINIUM AND THE ACTINIDES

Following actinium (group 3) are the 14 components of the actinide series (represented by the symbol An) combined with progressive filling of the 5f shell and so analogous to the lanthanides. All are radioactive; their largest-lived isotopes being shown in the progressively shorter half-lives reflect the decreasing stability of heavy nuclei, producing from the changing balance between the attractive strong communication and the repulsive Coulomb forces. Most actinide nuclei undergo α decay by emitting 4He, but for heavier components spontaneous fission into two fragments is an increasingly important alternative decay route.

Only uranium and thorium have half-lives long enough to survive since the formation of the Earth. Thorium is found together with lanthanides in the phosphate mineral monazite (LnPO4), and uranium perform as arnotite K2(UO2)2(VO4)2.3H2O and pitchblende U3O8c. Uranium is principally need as a nuclear fuel, as the isotope 235U undergoes neutron-induced fission, the nucleus divided into two smaller fragments together with more neutrons, which may thus initiate a chain reaction. The energy liberated (about 2×1010 kJ mol-1) is vastly larger than that obtainable from chemical reactions.

 

 


Related Discussions:- Actinium and the actinides

Why vitamine c is not stored in our body ?, There are two type of vitamine...

There are two type of vitamines 1.water soluble 2.fat soluble water soluble vitamines are B complex and C vitamines vitamine c is soluble in water so dissolve in water and ca

Explain about neutral and amphoteric oxides, Q. Explain about Neutral and A...

Q. Explain about Neutral and Amphoteric oxides? Neutral oxides have neither acidic nor basic properties and when dissolved in water, they give neutral solutions, e.g., CO, N

Ph problems, whats the pH if all i know "5.00mL of 1.30M HCl diluted to 0.4...

whats the pH if all i know "5.00mL of 1.30M HCl diluted to 0.490L "

Determine the physical characteristics of milk, Determine the physical char...

Determine the physical characteristics and presence of any additives in the given samples of milk. After undertaking this activity, you will be able to: • identify the phy

Succinic acid, Evolution of succinic acid,Physical and chemical properties ...

Evolution of succinic acid,Physical and chemical properties of succinic acid,succinic acid uses,succinic acid derivatives,succinic acid production techniques,biotechnology of succi

Explain the force constants of vibration, What kind of relation is there be...

What kind of relation is there between them and the force constants of vibration that you have calculated? The enthalpies of vaporization of carbon and silicon are 717 kJmol -1

The highest covalent character, Highest covalent character is found in: ...

Highest covalent character is found in: (a1  CaF 2                                              (2) CaCl 2               (3) CaBr 2                              (4)

Bromine - carbon tetrachloride test - hydrocarbon, Tests of unsaturation - ...

Tests of unsaturation - Bromine - carbon tetrachloride test The compound is liquefying in carbon tetrachloride or chloroform and after that a few drops of 5% bromine solution i

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd