How my mind works, sort of...

Up betimes, with a moderate case of the squirts, and nothing to do for it but to imbibe vast bowls of good Darjeeling tea with lots of milk and sugar, along with capsules of potassium chloride, and sweet/sour, candylicious "apple" bananas, and sit me down in front of my 27" ultra high definition monitor, and ask the Universal Net, via my Apple computer, questions about things that, by chance or disposition, interest me.  This morning's hot inquiry was: Why are Sodium and Potassium so similar?  Forming salts in a like manner with chlorine (and perhaps other Halogens?) and stable, non-toxic (except to powdery mildew) bicarbonates?  This led, of course, to a summoning up of the Periodic Table of Elements (which I've thought every so often about, but not looked at for at least a couple of decades, but) which this time examining, I noticed, right at the beginning of what I think are Rare Earths, Sc for Scandium, which I had never noticed before; but, which Googling, I find is mostly important as a (strengthening, weight reducing) alloy of Aluminum, the third most abundant element (after Oxygen and Silicon) on our amazing planet.