What is the geometry around the central atom in the following molecular model of SI6? 
Definitions:
Encephalization Quotient
A measure of brain size relative to body mass, used to estimate the relative intelligence or cognitive abilities of an animal.
Brain Size
The overall volume or mass of the brain, which can vary significantly between species and is often related to cognitive ability and complexity.
Expected Brain Size
An anticipated measurement or volume of the brain based on factors like age, genetics, and environmental conditions.
Flynn Effect
The observed substantial and long-term increase in both fluid and crystallized intelligence test scores measured in many parts of the world over the 20th century.
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