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【简答题】
（1）下表中的实线是元素周期表部分边界，请在表中用实线画出金属元素的边界（实线内的元素金属元素） （2）元素甲是第三周期原子半径最小的主族元素，化合物A是由甲元素等非金属元素组成的离子化合物写出其化学式______， （3）元素乙是第三周期原子半径最小的金属元素，丙是短周期元素中原子半径最大的元素，用电子式表示丙在甲单质中加热反应生成B的形成过程______． 丙在空气中加热反应生成的物质中含有的化学键是______． 写出乙、丙两种元素的最高价氧化物的水化物相互反应的离子方程式：______． （4）丁元素与丙元素同族并位下一周期，写出它与冷水反应的化学方程式：______．
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