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Transuranium elements are unstable and occur in extremely low concentrations in nature. Most are made artificially.
Periodic table is a table of elements, written in sequence in the order of atomic number or atomic weight and arranged in horizontal rows periods and vertical columns groups to illustrate the occurrence of similarities in the properties of the elements as a periodic function of the sequence.
The original form was proposed by Dmitri Mendeleev inusing relative atomic masses. These elements got their name from the fact that chemists first isolated them in their oxide forms.
These oxides somewhat resemble calcium, magnesium and aluminium oxides, sometimes called common earths.
Do you want to know more? Halocarbon is a compound containing no elements other than carbon, one or more halogens, and sometimes hydrogen. The simplest are compounds such as tetrachloromethane CCl elenentitetrabromomethane CBr 4etc. The lower members of the various homologous series are used as refrigerants, propellant gases, fireextinguishing agents, and blowing agents for urethane foams.
When polymerized, they yield plastics characterized by extreme chemical resistance, high electrical resistivity, and good heat resistance.
For any ionising radiation, absorbed dose D haoogeni the mean energy imparted to an element of irradiated matter divided by the mass of that element. It is often expressed as a percentage.
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Actinides actinons or actinoids are the fourteen elements from thorium to lawrencium inclusive, which follow actinium in the periodic table. The position of actinium is somewhat equivocal and, although not itself an actinide, it is often included with them for comparative ele,enti.
The series includes the following elements: Every known isotope of the actinide elements is radioactive. Traces of Pa, Np and Pu are consequently found, but only Th and U occur naturally to any useful extent.
Alkali metal is a elemnti that refers to six elements: These elements make up group 1 of the periodic table of elements. They all form singly charged positive ions, and are extremely reactive.
They react violently with water, forming hydroxides and releasing hydrogen gas and heat. Caesium and francium are the most reactive and lithium is the least. Antiparticle is a particle having the same mass as a given elementary particle and a charge equal in magnitude but opposite in sign.
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