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A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
"current": AC (for "alternating current"); less commonly, DC (for "direct current"); or even I (the symbol used in physics and electronics) Roman numerals: for example the word "six" in the clue might be used to indicate the letters VI; The name of a chemical element may be used to signify its symbol; e.g., W for tungsten
Crossword-like puzzles, for example Double Diamond Puzzles, appeared in the magazine St. Nicholas, published since 1873. [32] Another crossword puzzle appeared on September 14, 1890, in the Italian magazine Il Secolo Illustrato della Domenica. It was designed by Giuseppe Airoldi and titled "Per passare il tempo" ("To pass the time"). Airoldi's ...
These symbols are based on systematic element names, which are now replaced by trivial (non-systematic) element names and symbols. Data is given in order of: atomic number , systematic symbol, systematic name; trivial symbol, trivial name.
Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas . [ 10 ] Argon is the third most abundant gas in Earth's atmosphere , at 0.934% (9340 ppmv ).
From then until August 13, 1967, it was written by Kingsley's former assistant, Doris Nash Wortman; then it was taken over by Thomas H. Middleton for a period of over 30 years, until August 15, 1999, when the pair of Cox and Rathvon became just the fourth author of the puzzle in its history. [33] The name of the puzzle also changed over the ...
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The last puzzle in "Pencilwise" has generally been "The World's Most Ornery Crossword," a large standard crossword puzzle which has two sets of clues spanning three pages. One set, which is revealed by folding one page in half to hide the second page, consists of "Hard" clues (three stars), while the clues under this fold are "Easy" (one star ...
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