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关于副族元素的金属性递变规律

更新时间: 2020-08-15 00:00:00     

第四周期副族金属次外层电子由少到多分布,在铬和铜上最外层电子是1个而不是两个,体现了洪特规则(电子尽可能以半满、全满或全空的形式填充轨道亚层),到了第五六周期这种规律不明显,电子排布实际上无规律可言。金属性没有太明显的递变规律,主要是金属离子的规律,像二价离子从钒到镍逐步稳定。第六七周期第三副族存在镧系锕系收缩,使得其他副族原子半径减小,与第五周期原子半径相差无几,而核电荷数大,对核外电子的束缚力也就大,较第五周期的原子难失去电子,金属性减弱。

关键词: 关于 元素 属性 规律

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