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General : formulas
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 Message 1 of 2 in Discussion 
From: MSN Nicknamesurfgrinder11  (Original Message)Sent: 3/22/2008 5:56 AM
What is the formula for an ionic compound made of barium and nitrogen?


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 Message 2 of 2 in Discussion 
From: MSN Nickname·Steve·Sent: 3/22/2008 8:50 AM
Barium is in Group 2A (or your periodic table may just label the groups 1 through 18).  The Group 2A or simply Group 2 elements can all form +2 ions.  So the barium ion is Ba2+.  Nitrogen, from Group 5A (or Group 15) forms a �? ion.  So, the nitride ion is N3�?/SUP>.
 
Ba2+,  N3�?/SUP>
 
We want to combine the right number of each ion so that the overall charge is zero.  Three Ba2+ ions will have a charge of +6, while two N3�?/SUP> ions will have a charge of �?.  Therefore, the formula is Ba3N2. 
 
Steve