试题与答案

下表是短周期中部分元素的原子半径及主要化合价。 请回答: (1)X在元素周期表

题型:填空题

题目:

下表是短周期中部分元素的原子半径及主要化合价。 请回答:

 (1)X在元素周期表中的位置是____。

(2)V、W、Z三种元素的离子具有相同的电子层结构,三者的离子半径由大到小顺序是____。(用离子符号表示)。用离子方程式表示出Z离子可作净水剂的原因:____。

(3)某些元素可形成既含离子键又含共价键的化合物,写出其中一种化合物的电子式:____。

(4)1 g YU4气体完全燃烧生成液态水时,放出akJ的热量,则该反应的热化学方程式为________。

(5)现有Z与V2W2的固体混合物样品,加入稀盐酸至混合物完全溶解,所得的混合 液中c(Z3+ ):c(H+):c(Cl-)=1:2:8,则原固体混合物中,Z元素与W元素的质量比为____(最简整数比)。

答案:

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参考答案:A

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When I was a very young children,my father created a regular practice I remember well years late.Every time he arrived home at end of the day ,we’d greet het at the door.He would ask who we was and pretend not to knowing us,Then he and my mother would have had a drink while she prepared dinner and they would talk about his day and hers.While they chat,my father would lift my sister and me up to sit in the top of the fridge.It was both excited and frightening to be up there!

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