# An article in the local paper is discussing a new copper mine in New Mexico. It states that all that is needed to identify a

###### Question:

An article in the local paper is discussing a new copper mine in New Mexico. It states that all that is needed to identify a substance is the mass and volume of a sample. Is this an accurate statement? Why or why not? Yes, because mass and volume are unique properties of a substance. Yes, because mass and volume allows for finding density, which is a unique property of a substance. No, because although mass is a unique property of a substance, volume is not. No, because only density is a unique physical property of a substance and mass and volume are not enough to find it.

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### Consider the set of isoelectronic atoms and ions a2–, b–, c, d+, and e2+. which arrangement of relative radii is correct?

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