…Hydrogen forms compounds with almost all elements except the rare gases, which can be broadly divided into three types based on their properties: (1) Salt-like hydrides These have the composition MH n ( n is an integer between 1 and 3), where M includes the strongly electropositive alkali metal and alkaline earth metal ions on the left side of the periodic table, aluminum ions Al 3+ , and zinc ions Zn 2+ . Hydride ions are electrically negative (they can be considered as H - ), and when electrolyzed in a molten state, they migrate to the anode and become hydrogen gas. … From [Hydrogen storage metals]…Reactions between metals and hydrogen can be broadly divided into three types. (1) Salt-like hydrides in which hydrogen behaves as a monovalent anion. Alkali metal hydrides (LiH, NaH, KH, etc.) and alkaline earth metal hydrides (MgH 2 , CaH 2 , etc.) are produced by exothermic reactions and show a certain hydrogen dissociation pressure at a fixed temperature. The dissociation pressure increases at high temperatures. … *Some of the terminology explanations that refer to "salt-like hydrides" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…水素は希ガスを除くほとんどすべての元素と化合物を形成するが,その性質によりつぎの3種に大別される。(1)塩類似型水素化物salt‐like hydride MHn(nは1~3の整数値)の組成をもち,Mとしては周期表中左側の電気陽性の強いアルカリ金属およびアルカリ土類金属イオン,アルミニウムイオンAl3+,亜鉛イオンZn2+などが含まれる。水素化物イオンは電気的に陰性(H-とみなしうる)を示し,融解状態で電解すると陽極に移動し,水素ガスとなる。… 【水素吸蔵金属】より… 金属と水素の反応は大きく次の3種に分けられる。(1)水素が1価の陰イオンとして挙動する塩類似型水素化物 アルカリ金属水素化物(LiH,NaH,KHなど),アルカリ土類金属水素化物(MgH2,CaH2など)は発熱反応によって生成し,温度を定めると一定の水素解離圧を示す。高温にすると解離圧は上がる。… ※「塩類似型水素化物」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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