18-04-2016
Chemistry

contestada

Which electron shell contains the valence electrons of a radium atom in the ground state ?
1 . the sixth shell 2. the second shell 3. the seventh shell 4. the eighteenth shell

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Аноним Аноним

18-04-2016

I think the answer is the seventh since the valence electron configuration is [Rn]7s^2.

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