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

Grignard reagants, what are grignard reagants ? how are tthey prepared is l...

what are grignard reagants ? how are tthey prepared is laboratory ? what makes them so important in synthetic chemistry?

Define the cell potential of a galvanic cell, Define the Cell potential of ...

Define the Cell potential of a galvanic cell? The cell potential of a galvanic cell is the electric potential difference between terminals of the same metal, and is defined by

D block elements , explain why Cu2+ ion is not stable in aqueous solution?

explain why Cu2+ ion is not stable in aqueous solution?

Conversions, Conversion of phenol to salicyclic acid

Conversion of phenol to salicyclic acid

Which of the following ions is not having the configuration, Which of the f...

Which of the following ions is not having the configuration of neon: (1) F -                      (2) Mg +2                         (3) Na +                       (4

Gustation - the sense of taste, Gustation - The Sense of Taste The word...

Gustation - The Sense of Taste The word ‘taste' means not only a sensory response to the soluble materials in the mouth but also aesthetic appreciation. It has been noted many

#space lattice, #space lattice, unit cell, calculation of particles per uni...

#space lattice, unit cell, calculation of particles per unit cell, laws of crystallography, symmetry elements in crystals, derivation of braggs equation#

The compound in which cation is isoelectronic with anion is, The compound i...

The compound in which cation is isoelectronic with anion is : (1) NaCl                (2) CsF       (3) NaI                               (4) K 2 S Ans: K 2 S

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