January 2019 NY Regents Chemistry Exam
32 Given the information in the table below:
Diamond and graphite have different properties because they have different
(1) crystal structures
(2) electronegativities
(3) numbers of protons per atom
(4) numbers of valence electrons per atom
Solution: Diamond and graphite are both made of carbon. Therefore, they will have the same number of protons per atom as well as number of valence electrons and electronegativities, eliminating choices 2,3 and 4. Diamond if very hard while graphite is soft because they have different crystal structures.
Answer: 1
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