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

Explain the term- vacancies, Vacancies  A vacancy is a lattice position...

Vacancies  A vacancy is a lattice position that is vacant due to the atom is missing. It is formed when the solid is formed. Vacancies are simply empty atom site.

Salt, what is the name of the precipitate and the formulae of the precipita...

what is the name of the precipitate and the formulae of the precipitate of NH3 (aq) and Pb(NO3)2 (aq)

Inorganic qualitative analysis, use of ammonium chloride in 3 group of basi...

use of ammonium chloride in 3 group of basic radicals

Ammonical smell, how can we identify the ammonical smell and punjent smell?...

how can we identify the ammonical smell and punjent smell?

Use of acetonitrile compare to methanol, What is use of acetonitrile compar...

What is use of acetonitrile compare to methanol in RP-HPLC Method development? ACN is highly polar as compare to Methanol So give Better resolution for more compound and it has p

What are distinguishing characteristics of metallic bonding, What are disti...

What are distinguishing characteristics of metallic bonding?  Metallic  state  can  be  visualized  like an  array  of positive  ions,  with  a  common  pool  of electrons to

Aromaticity, compare the acidity between pyrole and pyrimidine

compare the acidity between pyrole and pyrimidine

What is use of ion pair reagents, WHAT IS USE OF ION PAIR REAGENTS? The c...

WHAT IS USE OF ION PAIR REAGENTS? The chemical substances that pair each other, to produces complexes. These can use for stabilization of one of the molecule that is more active

Organic chemistry, illustrate edman degradation and explain its importance

illustrate edman degradation and explain its importance

Alcohols, How do we prepare trihydric alcohols?

How do we prepare trihydric alcohols?

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