The formula of the ion is Sr²⁺
From the periodic table, we understood that Krypton (Kr) has 36 electrons.
From the question given above, we were told that the ion has the same electronic configuration as krypton. Thus,
The ion also have 36 electrons.
Finally, we shall determine the number of protons in the ion in order to determine the element that form the ion and also the symbol of the element.
Electrons in the ion = 36
Charge on ion = +2
Protons in the ion =?
Charge = Proton – Electron
2 = Proton – 36
Collect like terms
Proton = 2 + 36
Proton = 38
Considering the period table, the element with 38 protons (i.e atomic number of 38) is strontium with symbol Sr.
Therefore, the formula of the ion with the same electron configuration as krypton is Sr²⁺
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