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15. Which one of the following is the most
characteristic property of an element?
(a) Density
(b) Boiling point
(c) Mass number
(d) Atomic number
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Density is a physical property of matter that expresses a relationship of mass to volume. The more mass an object contains in a given space, the more dense it is. ... Density is also affected by the atomic mass of an element or compound.
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