EESA10H3 Lecture Notes - Bioavailability, Ionic Bonding, Covalent Bond

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Define: based on atomic weight, based on density (all elements having density higher than 7gm/cm3). Trace elements are elements found in a lower concentration. Opposite forces are attracted to each other. (na can react with cl form table salt) _ low electro negativity (tendency to lose rather than acquire electrons) _ nonessential elements (not needed by the body and can interfere in the body) _ high electro negativity (tendency to acquire rather than lose electrons) _ very toxic (form soluble organometallics: borderline: _ cr, cu, as, co, ni, zn, mn, fe. _ resistance species develop mechanisms not to uptake metal (example pb) www. notesolution. com. _ tolerance the capacity of species to withstand high level of metals. There are two types of chemicals: threshold and non-threshold chemicals. _ binding to nonsensitive compound structures (not very toxic) _ metabolic transformations to less toxic forms (methilation of as in marine biota) _ can develop multiple tolerance to chemicals - cu, pb, zn, cd.

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