The orderly arrangement of elements in the periodic table is based upon

a. atomic weights.
b. mass number.
c. neutron number.
d. atomic number.

d. atomic number.

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A service dog is easily identified by its:

A. size. B. breed. C. color. D. harness.

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Hyperkalemia is a potassium deficit in the bloodstream

Indicate whether the statement is true or false

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