What group of elements does the shaded area in the following periodic table indicate? 
Definitions:
Adaptive Response
A reaction or adjustment by an organism or system that helps maintain or restore a state of balance or appropriate functioning in response to environmental changes.
Depression Researcher
A scientist or clinician who studies the causes, symptoms, and treatments of depression.
Projective Tests
Psychological assessment tools where individuals respond to ambiguous stimuli, revealing hidden emotions and internal conflicts.
Assumption
A thing that is accepted as true or as certain to happen, without proof.
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