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Lewis Dot of Phosphorous Pentachloride

PCl5

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

Phosphorous having valence electrons in the 3rd energy level, will also have access to the 3d sublevel, thus allowing for more than 8 electrons.

It will hybridize to form 5 equal  dsp3 orbitals and will have a trigonal bipyramidal 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.

 

 

 

from  http://treefrog.fullerton.edu/chem/LS/PCl5LS.html

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