氟氟的相对原子质量最外层电子数为( ),反应中容易...

来源：蜘蛛抓取(WebSpider) 时间：2011-10-01 02:18 标签： 氟的相对原子质量
镁原子最外层电子数是（ ）,反应中容易（ ）个电子
Mg是12号元素,核外电子排布：2
2镁原子最外层电子数是（2 ）,反应中容易（失去2 ）个电子
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