- #1
Jchem
- 28
- 0
Hello all, I'm re-learning chemistry on my own and have a quick question that I can't find the answer to in my book.
Its about writing formulas.
For example, aluminum chloride. I know that Al has a valence number of +3, and I know that Cl has a valence number of -1.
So applying the "crossover rule" the answer is AlCl3.
Now the only reason I know the valence numbers of Aluminum and Chlorine is because I got them from a Valence number table with about 10 different elements.
My question is, how do I figure out the valence number for all the other elements?
thanks
Its about writing formulas.
For example, aluminum chloride. I know that Al has a valence number of +3, and I know that Cl has a valence number of -1.
So applying the "crossover rule" the answer is AlCl3.
Now the only reason I know the valence numbers of Aluminum and Chlorine is because I got them from a Valence number table with about 10 different elements.
My question is, how do I figure out the valence number for all the other elements?
thanks