Argon Argon Argon is a chemical element with symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as abundant as water vapor (which averages about 4000 ppmv, but varies greatly), 23 times as abundant as carbon dioxide (400 ppmv), and more than 500 times as abundant as neon (18 ppmv). Argon is the most abundant noble gas in Earth's crust, comprising 0.00015% of the crust. Nearly all of the argon in
Copia: Foundations of the Abundant Style book was immensely popular in England and in Europe, at least 85 editions of the book were printed in Erasmus' own lifetime, and countless more after that. Erasmus made three separate revisions to the original text, adding chapters each time. The original 1512 edition contained 153 chapters, which swelled to 206 in the final version that Erasmus completed before his death. Copia: Foundations of the Abundant Style Copia: Foundations of the Abundant Style () is a rhetoric textbook written by Dutch humanist Desiderius Erasmus, and first published in 1512. It was a best-seller widely used for teaching how to rewrite