00:01
In order to know what the chemical formula of the ionic compound is, we need to know what charges each element commonly takes on when it forms an ionic compound.
00:15
Barium is found in the periodic table in group 2a, therefore it typically takes on a 2 plus charge.
00:26
Oxygen is found in group 6a.
00:30
Group 6a elements typically take on a 2 minus charge.
00:34
So that means the formula for the ionic compound will be one barium for every one oxygen so that we have a neutral compound.
00:46
Next we have calcium, which is also found in group 2a, which will take on a 2 plus charge, and phosphorus.
00:55
Phosphorus is found in group 5a, elements in group 5a take on a 3 minus charge.
01:01
So when these two combine, we're going to need three calceums, giving us a total six plus charge, and two phosphorus atoms, or phosphides, now that they're anions, giving us a six minus charge, so that we have a neutral compound...