Actinium and the actinides, Chemistry

 

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.

 

 

Posted Date: 7/23/2012 7:57:47 AM | Location : United States







Related Discussions:- Actinium and the actinides, Assignment Help, Ask Question on Actinium and the actinides, Get Answer, Expert's Help, Actinium and the actinides Discussions

Write discussion on Actinium and the actinides
Your posts are moderated
Related Questions
how vulcanisation does changes the chareter of natural rubber

describe the steps involved in a sampling operation of a chemical sample

stability of cr3+ions from fe3+ions in aqueous medium

Harvesting techniques Many different harvesting techniques are used depending on the place of sale, the type of crop and the stage of maturity of the crop to be harveste

Tests for acetone - Legal test (a) Legal's test: while a few drops of prepared freshly sodium nitroprusside and sodium hydroxide solution are added or mixed to an aqueous solut



chain shortening in aldoses

Knocking - Characteristics of hydrocarbons The metallic sound throughout working of an internal combustion engine is known as knocking.  "As much the compression greater wil

structure and uses