Jerry C., List: The phrase is of *Peirce's* construction, on multiple occasions.
CSP: In a chemical molecule, each loose end of one atom is joined to a loose end, which it is assumed must belong to some other atom, although in the vapor of mercury, in argon, etc., two loose ends of the same atom would seem to be joined; and why pronounce such hermaphroditism impossible? Thus the chemical molecule is a *medad*, like a complete proposition. (CP 3.469; 1897) CSP: It will be convenient to begin with a little *a priori* chemistry. An atom of helion, neon, argon, xenon, crypton, appears to be a medad (if I may be allowed to form a patronymic from μηδέν). Argon gives us, with its zero valency, the one single type A. (CP 4.309; 1902) CSP: ... witness the chemical elements, of which the "groups," or vertical columns of Mendeléeff's table, are universally and justly recognized as ever so much more important than the "series," or horizontal ranks in the same table. Those columns are characterized by their several valencies, thus: He, Ne, A, Kr, X are medads ... (CP 1.289; 1906) Regards, Jon Alan Schmidt - Olathe, Kansas, USA Professional Engineer, Amateur Philosopher, Lutheran Layman www.LinkedIn.com/in/JonAlanSchmidt - twitter.com/JonAlanSchmidt On Sat, Mar 30, 2019 at 7:02 PM Jerry LR Chandler < [email protected]> wrote: > List, Gary: > > On Mar 30, 2019, at 2:21 PM, [email protected] wrote: > > In chemistry, a medad is an atom of valency zero, > > As far as I am aware, the term “medad” is not now used in the chemical > sciences and I can not recall ever seeing this term in the technical > literature of the chemical sciences. > > Gary, is this phrase of your personal construction? > > Cheers > > Jerry >
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