Author Question: In drawing the Lewis structure for the dichromate ion, how many valence electrons does chromium have? (Read 1165 times)

sammy

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The periodic table says that Cr has only 1 valence electron but other sources say that when drawing a Lewis structure, it is considered to have 6 valence electrons. Why?



erika

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6 is correct. Cr2O7(-2) gives you 7 oxygens = -14 + (-2) = 12 divided by two Cr per anion = 6 for the formal valence of Cr in dichromate.



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theo

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The six valence electrons of chromium are the 4s2 and the 3d4. In this way, the chemistry of chromium is analogous to that of sulfur, 3s2 3p4.



sammy

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Marking this topic solved :D

Thanks so much for the help



 

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