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根据原子结构,理解记忆化合价。在通常情况下,金属元素的原子最外层电子数目较少,在化学反应中通常容易失去电子而显正价(特殊点:金属元素没有负化合价),金属原子最外层有几个电子就能显正几价。非金属元素的原子最外层电子数较多,它和金属元素相化合时显负价,最外层形成稳定结构时,可获得几个电子就显负几价,如氯元素的原子最外层有7个电子,当它形成最外层8电子稳定结构时,需要获得1个电子,显
According to the atomic structure, understand the memory valence. Under normal circumstances, the metal elements of the outermost atoms of the atomic number is less in the chemical reaction is usually easy to lose the electron and significant price (special point: the metal element has no negative valence), the outermost metal atom has several electronic Can significant positive price. Non-metallic elements of the outermost atoms of the electron number is more, when it is combined with the metal element was negative price, the outermost layer to form a stable structure, you can get a few electrons on the significant negative price, such as the most atomic chlorine atoms There are seven electrons in the layer, and when it forms the outermost layer of the electron-stable structure, it needs to have one electron.