Hi, I'm new here. I'm actually studying the periodic table and while collectting the data on excel i noticed something. I wouldn't see it with the usual display of a periodic table but when you put it all in a sheet, ligns after ligns it become obvious to me. Argon Ar (noble gaz) is followed by Potassium K (Alkali metal) and then Calcium Ca (Alkaline earth metal) Same goes for H, Li, Br or Ne, Na, Mg or Kr, Rb, Sr or Xe, Cs, Ba or Rn, Fr, Ra so a noble gas is followed by an alkali metal then an alkaline earth metal. Why ?