I used to do this with Sodium and Potassium in high school too, but I never had… Cesium! Fun, fun, fun.
Fun fun fun!!!
Kudos for finding that one.
Alas that Francium is highly radioactive and unstable – getting a couple of grams together would be exceedingly difficult. Pity.
I had no idea that Rubidium and Cesium were SO MUCH better than Potassium!
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