From the activity list included in this problem,which element/ion is the easiest to reduce?
Activity Series = 
Definitions:
Perimeter
The total length around the boundary of a two-dimensional shape.
Falling Object
An object that is under the sole influence of gravity, typically described in physics with equations of motion.
Picture
A visual representation of an object, scene, or person produced on a surface.
Dimensions
Measurements that define the size or shape of an object, often used in geometry to describe figures in two or three-dimensional space.
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