hexavalent chromium

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From: Geoff Ruth (gruth@leadershiphigh.org)
Date: Thu Jun 09 2005 - 18:02:21 PDT 

Message-Id: <p06110419bece96d2d4d5@[192.168.1.147]>
Date: Thu, 9 Jun 2005 18:02:21 -0700
From: Geoff Ruth <gruth@leadershiphigh.org>
Subject: hexavalent chromium

I don't understand why Cr+6 is called hexavalent chromium. The way I
think of the word "hexavalent," it seems like it should indicate that
the chromium atom has 6 valence e-. This isn't true for Cr+6 -- it
has 0 valence electrons.

Can anyone explain why metal ions are sometimes called x-valent where
the x shows the charge on the ion?

Thanks for clearing this mystery up,
Geoff

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