Page 211 - Chemistry eBook
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“Un-crisscrossing”
Given: XCl2. What group is X in?
1. Bring the numbers up by crisscrossing.
2. X must have an oxidation number of +2. This means that X is from group 2.
Sometimes, you
will need to “un- crisscoss”. Let’s look at this example.
UNIT 6: MATH IN CHEMISTRY © 210
