Biology, 22.01.2021 16:20 julianastri6841

Radium in an element found in group 2 and period 7. in a normal radium atom, how many energy levels contain at least one atom? A. 1 B.6 C.7 D.8

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Radium in an element found in group 2 and period 7. in a normal radium atom, how many energy levels...

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