Nitrogen family Phosphorous

The structure has a total of 32 electrons of these, 21 are accounted for by the chlorines (3 Cl s x 7 valence electrons each) of the 11 electrons remaining, 6 come from the oxygen. This leaves 5 electrons unaccounted for these must come from E. Therefore, E must be a member of the nitrogen family and since it is a third period element E must be phosphorous(P)... 

PHA are a family of linear polyesters of 3, 4, 5 and 6-hydroxyacids, synthesised by a wide variety of bacteria through the fermentation of sugars, lipids, alkanes, alkenes and alkanoic acids. In the presence of an abundant carbon source when other essential nutrients such as oxygen (Oi), phosphorous (P) or nitrogen (Ni) are limited, many microorganisms usually assimilate and store PHA for future consumption [1]. They are found as discrete cytoplasmic inclusions in bacterial cells. These polymeric materials are able to be stored at high concentrations within the cell since they do not substantially alter its osmotic state [2]. Once extracted from the cells, PHA exhibit... 

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