Lead metal group

SOLUTION The mixed solution will contain Na+, P043 , Pb24, and NO, ions. All nitrates and all compounds of Group 1 metals are soluble, but phosphates of other elements are generally insoluble. Hence, we can predict that Pb2+ and P043- ions will form an insoluble compound and that lead(II) phosphate, Pb,(P04)2, will precipitate ... [Pg.94]

Synthetic routes to mixed cyclopentadienyl/guanidinato complexes of Group 4 metals have also been developed. Scheme 78 illustrates two typical reactions leading to such compounds. [Pg.245]

HEAVY METALS A group of metals which are sometimes toxic and can be dangerous in high concentrations. The main heavy metals covered by legislation are cadmium, lead, and mercury. Industrial activities such as smelting, rubbish burning, waste disposal and adding lead to petrol increase the amount of toxic heavy metals in the environment. [Pg.14]

Radium, like most other group II metals, is soluble in seawater. Formation of Ra and Ra by decay of Th in marine sediments leads to release of these nuclides from the sediment into the deep ocean. Lead, in contrast, is insoluble. It is found as a carbonate or dichloride species in seawater (Byrne 1981) and adheres to settling particles to be removed to the seafloor. [Pg.497]

The reaction between a metal alkyl and a covalent halide of another element is sometimes made possible by the fact that transfer of the alkyl group leads to a crystalline product. An example of this type is the reaction between a sodium alkyl and a covalent halide such as SiCl4. [Pg.397]

The currently known carbometallation chemistry of the group 6 metals is dominated by the reactions of metal-carbene and metal-carbyne complexes with alkenes and alkynes leading to the formation of four-membered metallacycles, shown in Scheme 1. Many different fates of such species have been reported, and the readers are referred to reviews discussing these reactions.253 An especially noteworthy reaction of this class is the Dotz reaction,254 which is stoichiometric in Cr in essentially all cases. Beyond the formation of the four-membered metallacycles via carbometallation, metathesis and other processes that may not involve carbometallation appear to dominate. It is, however, of interest to note that metallacyclobutadienes containing group 6 metals can undergo the second carbometallation with alkynes to produce metallabenzenes, as shown in Scheme 53.255 As the observed conversion of metallacyclobutadienes to metallabenzenes can also proceed via a Diels-Alder-like... [Pg.284]

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