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 fluorine?
Definitions:
Success Rate
The proportion or percentage of attempts that are successful, often used to gauge the effectiveness of a process or treatment.
New Racket
A fresh piece of equipment used in racket sports such as tennis, badminton, or squash.
Probability
The likelihood or chance of a specific event occurring, typically expressed as a number between 0 and 1.
Seat Belts
Protective mechanisms built into vehicles to shield passengers from injurious motion that might occur during an accident or abrupt halt.
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