Each of the pictures (a) -(d) represents one of the following substances at 25°C: potassium,fluorine,iodine,potassium fluoride,not necessarily in that order. 
-Which picture corresponds to iodine?
Definitions:
Operant Conditioning
A method of learning where the intensity of an action is altered by either rewards or penalties.
White Rat
Often used in laboratory experiments, these are albino rats specifically bred for research purposes.
Rosalie Rayner
An American psychologist known for her work with John B. Watson on the Little Albert experiment, demonstrating classical conditioning in humans.
Freudian Analysis
A psychotherapeutic approach developed by Sigmund Freud focusing on uncovering unconscious thoughts and motivations to treat psychopathologies.
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