2 5 Therefore, option C is correct. 0 0 1 0 Is The Phosphate Ion More Or Less Stable? Put P as central atom. A Lewis structure of OCl- ion is drawn below. In PO43- ION, THE FORMAL CHARGE ON EACH OXYGEN ATOM AND P-O BOND ORDER RESP ARE A -0 75,0 6 B -0 75,1 0 C -0 75,1 25 D -3,1 25 - Chemistry - Chemical Bonding and … For phosphate ion the average formal charge for phosphorus is zero since it is zero in all the resonance structures, and the average formal charge on oxygen is .-3/4. The common arrangement of oxygen that has a formal charge of zero is when the oxygen atom has 2 bonds and 2 lone pairs. 7 5 Bond order = Number of resonating structures Number of bonds = 4 5 = 1 . Formal charge is the difference between the number of valence electrons in a free atom and the number of electrons assigned to the atom in a Lewis structure. 1 Pt. This structure will obey the octet rule and the formal charges will be -1 on each of the four O atoms and +1 on the P atom (net -3 as required). The formal charges on O and P depend upon how you draw the Lewis structure. [2] c.i. Have you registered for the PRE-JEE MAIN PRE-AIPMT 2016? Once we know how many valence electrons there are in PO4 3- we can distribute them around the central atom with the goal of filling the outer shells of each atom. Then put 3 lone pairs of electrons on each O atom. PO4^3- is often represented with four identical P-O bonds. Therefore, the four oxygen atoms in PO4-3 have a total charge of -8, and the phosphorus atom must have a charge of +5 to result in an overall charge of -3 for the ion as a whole. Oxidation state is the charge on an element if all the bonds are 100% ionic, which of course, we know they are not. 2. In the Lewis structure of PO43- there are a total of 32 valence electrons. Formal charge on oxygen atom = 4 − 3 = − 0. It can also be represented with a structure where one of the oxygen atoms is doubly bonded to the central P atom. Compare PO43-to PO4 With No Charge. 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