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When could the octet rule be broken? In Wednesday's lecture, Dr. Lavelle drew the Lewis structure for phosphorus pentachloride (PCl5), and 5 chlorine atoms were attached to one phosphorus. Why can Phosphorus have 5 bonds instead of 4?
Since P is the least electro-negative, it will be the central element. Considering that anything from group 3 to 7 in the p block has an expanded octet, which includes P, that means that it will break the octet rule.
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