右图是周期表的一部分,已知A、B、C、D都是短周期元素,四种元素

右图是周期表的一部分,已知ABCD都是短周期元素,四种元素原子核外共有56个电子,推断ABCD各是什么元素,写出他们的元素符号:A            B         C        D       

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