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【简答题】
有 A 、 B 、 C 、 D 四种元素。已知 : 1 它们均为周期表中前 20 号元素 ,C 、 D 在同一周期 ,A 、 B 在同一主族 ; 2 它们可以组成化合物 B 2 C 2 、 A 2 C 、 DC 2 等 ; 3 B 的阳离子与 C 的阴离子的核外电子排布相同 ; 4 B 2 C 2 同 A 2 C 或 DC 2 反应 C 2 的气体 ,B 与 A 2 C 反应产生气体 A 2 ,A 2 与气体 C 2 按体积比 2 ∶ 1 混合后点燃能发生爆炸 , 其产物是一种无色无味的液体 ( 在常温下 ) 。请回答下列问题 : (1) 写出 A 、 B 、 C 、 D 四种元素的符号 : A ,B ,C ,D 。
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