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Lewis Dot of the Triiodide Ion



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I does not follow the octet rule. It will hold more than 8 electrons.

Iodine having valence electrons in the 4th energy level, will also have access to the 4d sublevel, thus allowing for more than 8 electrons. I3- is dsp3 hybridized and contains 3 lone pairs and 2 bonding pairs of valence electrons around the Iodine. The VSEPR predicts the linear shape.

Elements in the first 2 periods of the Periodic Table do not have access to the d sublevel and must adhere to the octet (or duet H and He) rule.

ABOUT I3-  The triiodide ion is responsible for the well-known blue-black color which arises when iodine solutions react with starch.



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