February 22, 2017

Homework Help: Chemistry

Posted by candy on Thursday, April 2, 2009 at 1:11pm.

Hi Dr Bob,

I understand the 2nd method but need to clarify the 1st method.If I only wish to draw 1 Al and 1 O, then I need to include the "plus" sign and draw the 'dot and cross' diagram as
2[Al]+ 3[O] , with the charges of course, right?

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

When drawing the 'dot and cross' diagram to show the ionic bonding in aluminium oxide, Al2O3, do we place the nos "2" and "3" in front of the brackets containing the 'dot and cross' diagram, e.g 2[Al]3[O]?
I notice that some books place the "2" and "3" as subscripts while others place the nos. in front.


Chemistry - DrBob222, Thursday, April 2, 2009 at 11:39am
The 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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