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A student observes a model of two bonded atoms. She is told that both atoms are nonmetals. Which of the following is a valid conclusion?


A. The student is looking at a model of atoms held together by a covalent bond.

B. The student is looking at a model of a metalloid.

C. The student is looking at a model of a crystal lattice.

D. The student is looking at a model of atoms held together by an ionic bond.