mechanism of halogen and nitrogen
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Depending on who you ask, there are either 5 or 6 halogens. Fluorine, chlorine, bromine, iodine, and astatine definitely are halogens. Element 117, which has the placeholder name of ununseptium, might have some properties in common with the other elements.
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Nitrogen compounds such as urea, amine and guanidine are used to ...... The mechanism of the fire-retardant action of both melamine ...
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Something that is extended has been fully stretched out or elongated. An extended period of time is an extremely long period of time. To extend something is to make it longer, either physically or in terms of time. Anything extended has been stretched out in this way
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