How many nucleons are there in an atom of 
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Definitions:
Residual Variation
The difference between observed values and those predicted by a statistical model, reflecting the portion of variation unexplained by the model.
Two Factors
In experimental design, refers to experiments that investigate the effect of two independent variables on a dependent variable.
Total Sum
The aggregate or overall total of a series of numbers or quantities.
Squares
In mathematics, the result of multiplying a number by itself.
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