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 potassium?
Definitions:
AIDA Plan
A marketing strategy that stands for Attention, Interest, Desire, and Action, aimed at guiding potential customers through the stages of purchasing.
Single Event
An occurrence or happening that takes place at a specific time and location.
Long-Term Relationships
Connections or associations that are built to last over an extended period, emphasizing commitment and ongoing interaction.
AIDA Model
A marketing framework that outlines the stages of consumer engagement: Attention, Interest, Desire, and Action, used to guide promotional strategies.
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