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- Back to writing the formula, I find the cross-over method (aka criss-cross method/rule) the best when it comes to writing a foolproof formula. I mean who doesn’t want to get the formula right 100% of the time? So here goes: Write out the ions: Cation on the left, anion on the right. Cross the number in the charge over.
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The general solution of $|a|x=|b|y\ \ s.t.\ \ x,y \in \mathbb{N}$ is $x=n|a|$ and $y=|n|b|$ where $n \in \mathbb{N}$, that is we can use $x=2|a|,3|a|...n|a|$ and similarily $y=2|b|,3|b|...n|b|$ then why use $x=|a|$ and $y=|b|$ only?
Sep 22, 2020 · This video is designed for high school chemistry students and explains how to use the criss-cross method to determine the formula of an ionic compound from its ions.
- 8 min
- 30.5K
- Patrick Haney
Dec 22, 2019 · The Criss-Cross method is an easy way to find the subscripts on elements when writing formulas for ionic compounds based on their name.
- 6 min
- 429.1K
- Wayne Breslyn (Dr. B.)
Here's a step-by-step guide on how to employ the Criss Cross Method:Identify the Ions: Begin by identifying the cation (the positively charged ion) and the a...
- 5 min
- 34.8K
- Wayne Breslyn (Dr. B.)
May 28, 2024 · This "shortcut" is known as the "Criss-Cross Method" because the numerical values effectively "criss-cross" over one another when they are moved to their new positions. The resultant base formula is identical to what was derived using the first method: K 3 N 1.
Back to writing the formula, I find the cross-over method (aka criss-cross method/rule) the best when it comes to writing a foolproof formula. I mean who doesn’t want to get the formula right 100% of the time? So here goes: Write out the ions: Cation on the left, anion on the right. Cross the number in the charge over.
Aug 4, 2015 · The criss-cross method makes it easier to determine the subscripts for each element in an ionic compound. Using this method, the number associated with the charge of the first ion is assigned as the subscript of the second ion.
