 | Alkali Metals碱金属
Group I of the Periodic Table is composed of highly reactive metals. They react vigorously with water to produce hydroxides and release hydrogen. Even in air they react quickly to cover their surfaces with oxides. In nature they are found in ionic compounds, but never in the pure state. Their chemical activity increases as you move downward through the periods from Li to Na to K, etc. 元素周期表的第IA族由高度活泼的金属组成。它们能剧烈地与水反应，生成氢氧化物并释放氢气。即使在空气中，它们也迅速反应，使表面覆盖氧化物。在自然界中，它们以离子化合物的形式存在，但 never 以纯金属形式存在。随着从锂（Li）到钠（Na）到钾（K）等向下移动，它们的化学活性逐渐增强。
Alkali metals tend to lose one electron and form ions with a single positive charge. They form ionic compounds (salts) in reaction with the halogens (alkali halides). Sodium and potassium ions form important constituents of body fluids (electrolytes). 碱金属倾向于失去一个电子，形成带单个正电荷的离子。它们与卤素反应生成离子化合物（盐类）（碱金属卤化物）。钠离子和钾离子是体内液体（电解质）的重要组成部分。
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| Chemistry of the Elements
元素的化学 |
Periodic Table
Chemistry concepts
索引 元素周期表 化学概念
| HyperPhysics | R Nave |
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