A blast from the past
I recently attended my ##th (not a typo, I just don't want to think about the number) college reunion. As one tends to do at these things, I walked through my old stomping grounds. A lot has changed over the years. One thing I noticed was the interesting teaching aid for learning how to write ionic formula shown below. I don't remember seeing those when I was a student, so I imagine they were tucked away in some back corner collecting dust, which is a real shame.