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The oxygen atoms in the ion do obey the octet rule. The phosphorus atom has more than eight electrons in its valence shell. It is because of the existence of vacant 3d orbitals.

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Q: Does PO4 negative three charge 3 obey the octet rule?
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Will any of the chlorine oxides obey the octet rule?

No chlorine oxides will obey the octet rule.


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