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The element with 58 electrons is Cerium (Ce). It has the atomic number 58. Cerium is a 'Rare Earth' metal in Period 6 (Lanthanide group) of the Periodic Table.
With mass number 140 this Ce is the first and stable isotope (142 is weakly unstable, 141 is a radioactive artificial isotope)
[It has 58 electrons in 6 shells with 2 electrons in the outer shell (4f-block), so it is NOT a 'Transition' group metal of the 5d-block starting with 72Hf]
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