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Neutrons carry no charge.

A) True
B) False

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The presence of trace elements is useful because they provide markers that may establish the source of a material.

A) True
B) False

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The atoms of hydrogen,deuterium,and tritium all have the same number of protons,but differ in the number of neutrons they possess.These substances are:


A) Elements.
B) Compounds.
C) Molecules.
D) Isotopes.

E) A) and B)
F) B) and D)

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Paint specimens are best compared side by side under a ________ microscope.

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