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Write the electronic configuration of th...

Write the electronic configuration of the elements with the atomic numbers 61, 91, 101 and 109.

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Promethium or `Pm(Z= 61) = [Xe] 4f^(5) 4d^(0) 6s^(2)`
Protactinium or `Pa (Z = 91) = [Rn] 5f^(2) 6d^(1) 7s^(1)`
Mendelevium or `Md(Z = 101) = [Rn] 5f^(13) 6d^(0) 7s^(2)`
Meitnerium or `Mt(Z = 109) = [Rn] 5f^(14) 6d^(7) 7s^(2)` .
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