What is the geometry around the central atom in the following molecular model of I3-? 
Definitions:
Denisovan Genome
The genetic blueprint of the Denisovans, an extinct species of archaic humans, obtained from ancient DNA samples.
Introgression
The transfer of genetic material from one species to another through hybridization and backcrossing, leading to the incorporation of foreign genes into a population.
Synonymous Substitution Rate
The rate at which point mutations occur in a DNA sequence that do not alter the encoded amino acid due to the redundancy of the genetic code.
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