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The answer is 7. We start this 5th level of the periodic table with Rb(Z=37) and Sr. They fill up the 5s orbitals, and as we go to higher Z numbered elements, the filling of the 4d orbitials begins.

2007-05-25 20:09:33 · answer #1 · answered by cattbarf 7 · 0 0

it would be the atomic number Z has.

2007-05-26 03:07:54 · answer #2 · answered by gmchugh90 1 · 0 0

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