What is the geometry around the central atom in the following molecular model of CCl4? 
Definitions:
Placebo Effect
A phenomenon in which a person's condition improves because they believe they are receiving treatment, even though the treatment has no therapeutic value.
Participant Bias
A type of bias that occurs when participants in a study act or respond differently because they know they are being observed.
Double-Blind Experiments
Double-Blind Experiments are studies where neither the participants nor the experimenters know who has been administered the treatment or the placebo, reducing biases.
Experimenter Bias
The influence of the experimenter’s expectations on the outcome of research.
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