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一、围绕前20号元素核外电子排布与单质的化学性质,考查学生对族、周期的掌握以及常见物质性质的分析推理能力【例1】(07全国卷历26)W,X,Y和Z都是周期表中前20号元素,已知:①W的阳离子和Y的阴离子具有相同的核外电子排布,且能形成组成为WY的化合物;②Y和Z属同族元素,它们能形成两种常见化合物;③X和Z属同一周期元素,它们能形成两种气态化合物;④W和X能形成组成为WX_2的化合物;⑤X和Y不在同一周期,它们能形成组成为XY_2的化合物。
First, the chemical properties of the external nuclear arrangement and elementality of the former No. 20 element are examined to examine the student’s ability to analyze and determine the family and cycle, as well as common material properties [Example 1] (07 National Calendar 26) W, X, Y Both Z and Z are the top 20 elements of the periodic table, and it is known that the 1W cation and the Y anion have the same extranuclear electron arrangement and can form a compound having a composition of WY; 2Y and Z belong to the same family element and they can form Two common compounds; 3X and Z are elements of the same cycle, they can form two gaseous compounds; 4W and X can form a compound of composition WX_2; 5X and Y are not in the same cycle, they can form a compound with composition XY_2.