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March 28, 2015

March 28, 2015

Posted by **candy** on Thursday, April 2, 2009 at 5:10am.

I notice that some books place the "2" and "3" as subscripts while others place the nos. in front.

- Chemistry -
**SraJMcGin**, Thursday, April 2, 2009 at 10:04amSince this is definitely not my field, try the following:

http://www.google.com/search?q=numbers+2+and+3+in+a+dot+and+cross+diagram&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a

If you see them in more than one position, it may be that either is acceptable.

Sra

- Chemistry -
**DrBob222**, Thursday, April 2, 2009 at 11:39amThe link provided by SraJMcGin refers more to the cross product of mathematics than to your question.

What you want to do with ionic compounds is to show

2Al^{+3}+ O^{-2}with two pairs of electrons on the left, top, right, and bottom of the O. I can't draw them on the board. The other way of doing it is to show one Al ion with another just below it, then to the right show 3 O atoms, one above the other, and put in the dots and crosses on the O. Don't forget to put the -2 charge on each oxygen when you have finished.

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