The following pictures represent aqueous solutions of three acids HA (A = X,Y,or Z) ,with water molecules omitted for clarity.Unshaded spheres represent hydrogen atoms or ions and gray spheres represent A atoms or ions.Which of the three is the strongest acid,and which is the weakest? 
Definitions:
Negative
A term indicating the absence of a property or condition, often used in contrast to its presence.
Argue
To present reasons for or against something in a discussion or debate.
Contemporary Psychology
The study of behavior and mental processes using modern theories and methodologies.
Physiological Psychology
A subfield of psychology that studies the physiological bases of psychological processes and behaviors.
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