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Hydrogen is a chemical element; it has symbol H and atomic number 1. It is the lightest element and, at standard conditions, is a gas of diatomic molecules with the formula H 2, sometimes called dihydrogen, [11] hydrogen gas, molecular hydrogen, or simply hydrogen. It is colorless, odorless, [12] non-toxic, and highly combustible.
2016 – Toyota releases its first hydrogen fuel cell car, the Mirai. 2017 – Hydrogen Council is formed to expedite development and commercialization of hydrogen and fuel cell technologies. EMEC produces world's first tidal-powered hydrogen in Orkney, Scotland.
Henry Cavendish FRS (/ ˈ k æ v ən d ɪ ʃ / KAV-ən-dish; 10 October 1731 – 24 February 1810) was an English experimental and theoretical chemist and physicist.He is noted for his discovery of hydrogen, which he termed "inflammable air". [1]
On December 20, 2013, he was honored with an interactive Google Doodle commemorating the "100th anniversary of the first crossword puzzle" [8] [9] [10] with a puzzle by Merl Reagle. Numerous other constructors also created tribute puzzles to Wynne to commemorate the anniversary.
The abbreviation is not always a short form of the word used in the clue. For example: "Knight" for N (the symbol used in chess notation) Taking this one stage further, the clue word can hint at the word or words to be abbreviated rather than giving the word itself. For example: "About" for C or CA (for "circa"), or RE.
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Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air, and published a paper on the production of water by burning inflammable air (that is, hydrogen) in dephlogisticated air (now known to be oxygen), the latter a constituent of atmospheric air (phlogiston theory).
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