1.

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

Answer»

Solution :Z = 61 (Promethium, PM), Electronic configuration : `[Xe]^(54)4f^(5)5d^(0)6S^(2)`.
Z = 91 (Protactium, Pa), Electronic configuration : `[RN]^(86)5f^(2)6d^(1)7s^(2)`.
Z = 101 (Mendelevium, Md), Electronic configuration : `[Rn]^(86)5f^(13)6d^(0)7s^(2)`
Z = 109 (Meitnerium, Mt), Electronic configuration : `[Rn]^(86)5f^(14)6d^(7)7s^(2)`.


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