Which ion is NOT isoelectronic (i.e.has the same electron configuration) with Ar? The electron configuration of Ar is shown. 
Definitions:
Placebo
An inert substance or treatment given to a control group in experiments to compare effects with those of actual treatments.
Vaccinated
The state of having received a vaccine to produce immunity against a specific disease.
Blood Type
A system for identifying blood types through the detection or nondetection of inherited antigens on the surfaces of red blood cells.
Association
A statistical relationship between two or more variables, indicating how changes in one variable are connected with changes in another.
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