In 1995 a Japanese cult attacked the Tokyo subway system with the nerve gas sarin, which focused world attention on the dangers of chemical warfare agents. The connectivity of atoms in the sarin molecule is shown below. Complete the Lewis structure by adding bonds and lone pairs as necessary. Assign formal charges to the P and O atoms, and determine the local molecular geometry around the central oxygen atom. 
Definitions:
Retrograde Amnesia
The inability to recall events or knowledge acquired before suffering an injury or the emergence of a disease.
Procedural Memories
Procedural memories are a type of long-term memory for performing certain actions and skills, essentially how to do things, such as riding a bicycle or playing an instrument.
Long-Term Memories
Memories that can be stored for an extended period, from days to decades.
Hippocampus
A major component of the brains of humans and other vertebrates, playing critical roles in the consolidation of information from short-term memory to long-term memory and in spatial memory that enables navigation.
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