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Posted by on Sunday, September 16, 2012 at 9:47am.

Na and K have low first and high second ionization potentials, whereas Mg and Ca have
low values for both first and second potentials.
These observations suggest that

  • science - , Sunday, September 16, 2012 at 10:42am

    To me, Mg and Ca have a normal valanece of +2.

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