• Elements in the first column all have one electron in their outermost shell. Those in the second column have two outer electrons, and so on.

    第一元素外电子层一个电子第二元素含有两个电子,依此类推。

    www.ecocn.org

  • Elements in the first column all have one electron in their outermost shell. Those in the second column have two outer electrons, and so on.

    第一元素外电子层一个电子第二元素含有两个电子,依此类推。

    www.ecocn.org

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