Four elements are represented by the letters J,K,L, and M. The four elements are all activ

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active metals and have the same number of valence electrons and a filled valence subshell. Element J is the most metallic and has electrons in five energy levels. Element M has a larger atomic radius than either K or L but is small than J. L has a higher first ionization energy than does K. Identify the elements. THis is what I have trouble on. 

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