今有A、B两种原子,A原子的M层比B原子的M层少3个电子,B原子的L层电

今有AB两种原子,A原子的M层比B原子的M层少3个电子,B原子的L层电子数恰为A原子L层电子数的2倍。则AB分别是

  AHeB        BCCl        CNaSi        DCAl

答案

D

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