Therefore the correct answer is D.

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The term valence refers to the outermost shell.

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Presentation transcript:

Therefore the correct answer is D. QUESTION: What type of bond holds the atoms together in the polyatomic ions chromate (CrO42-) and nitrate (NO3-)? A. ionic, ionic, B. ionic, covalent C. covalent, ionic, D. covalent, covalent In ANY polyatomic ion, the atoms are sharing electrons. In other words, the atoms are held together by covalent bonds. An ionic bond is what holds two ions of opposite charge together. For example, a Na+ ion and a NO3- ion are held together by an ionic bond. But the atoms within the NO3- ion are held together by covalent bonds. Metal + nonmetal is usually, not always, ionic. Cr-to-O bonds in chromate are covalent. SCRIPT: What type of bond holds the atoms together in the polyatomic ions chromate (CrO42-) and nitrate (NO3-)? A. ionic for both chromate and nitrate, B. ionic for chromate, covalent for nitrate C. covalent for chromate, ionic for nitrate, Or D. covalent for both chromate and nitrate. PAUSE CLICK In ANY polyatomic ion, the atoms are sharing electrons. In other words, the atoms are held together by covalent bonds. Therefore the correct answer is D. Confused?… CLICK An ionic bond is what holds two ions of opposite charge together. For example, a sodium ion and a nitrate are held together by an ionic bond. But the atoms within the nitrate ion are held together by covalent bonds. Furthermore, a metal atom and a nonmetal atom, do not always form a ionic bond. They usually do but not in the case of chromium and oxygen In chromate ion. The Cr-to-O bonds in chromate are covalent. PAUSE CLICK END RECORDING

Video ID: 1-19-2 © 2008, Project VALUE (Video Assessment Library for Undergraduate Education), Department of Physical Sciences Nicholls State University Author: Glenn V. Lo Narrator: Funded by Louisiana Board of Regents Contract No. LA-DL-SELECT-13-07/08