下表为元素周期表前四周期的一部分，下列有关A、B、C、D、E、F六种元素的叙述正确的是
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| A |
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B |
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| C |
D |
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E |
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F |
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A．常压下六种元素的单质中，F单质的沸点最高
B．晶体E中不存在化学键
C．D元素的非金属性比B元素的非金属性强
D．单质A、C均没有同素异形体
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