Graphite is: a. harder than glass. b. the lead in the pencil you write with. c. the polymorph of galena. d. composed of carbon atoms, arranged as tetrahedrons, held together with strong covalent bonds. e.

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Nitrogen-14 and nitrogen-15 are isotopes of the same element. how do these two isotopes differ? a. they have different numbers of nuclei. b. they have different numbers of protons. c. they have different numbers of neutrons. d. they have different numbers of electrons.