This will be another quick case of extending a word by adding letters progressively. I like how this batch crosses a variety of sciences: An ION is any atom with a charge due to having excess or missing electrons. If missing an electron, it will be a positive ion. If it has an extra electron to share, it will be a negative ion. Table salt is made up of a positive sodium (Na+) and a negative chlorine (Cl-) ion. (In the simplest form, or when in solution in water.) That is basic chemistry. Now a PION is a subatomic particle, coming from physics. The name is shortened from pi-meson. The exact nature of this particle can be found here . For our purposes, it's just a useful word to know in Scrabble or other games. Next in line is the PRION, which comes from biology . Believe it or not, there are infectious particles that are smaller than bacteria, even smaller than viruses ... PRIONS are simply misfolded mutant proteins that can cau...
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