most mass measurements of pure substances give the mass of a mixture of isotopes. in other words, we can say that mixtures are not pure but the mixture of all known mixtures such as the macroscopic mass of an oxygen molecule does not correspond to the microscopic mass. the macroscopic mass...
2844 40 00 Radioactive elements and isotopes and compounds other than those of sub- headings 2844 10,2844 20 or 2844 30; alloys, Restricted Import subject to Atomic Energy Act, 1962 and Rules there under. Import subject to Atomic Energy Act, 1962 and Rules there under. Import subject to...
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Alkaline-earth metal, any of the six chemical elements that comprise Group 2 of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). The alkaline-earth elements are highly metall
Elements of group 18 are all gases and have completely filled outermost orbital, that's why these elements are highly stable and don’t react with other elements easily. This is the reason these elements are known as inert gases or inert elements. The word inert means chemically unreactive. ...
Probes also can be indirectly labeled with biotin or digoxygenin, or labeled with radioactive isotopes such as 32P and 3H, although secondary detection molecules or further processing then is required to visualize the probes. For example, a probe labeled with biotin can be detected by avidin con...