Which element has the following electron configuration: [Kr] 5S₂ 4d10 5p2?

Question

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The electron configuration given indicates that the element is in the fifth period (Kr) and has 2 valence electrons in the 5p sublevel. The full 4d sublevel indicates that the element is a transition metal, which narrows the choices down to lead (Pb), tin (Sn), and zirconium (Zr). However, Pb and Zr have a different configuration for their valence electrons, so the correct choice is Sn.

Which Element Has the Following Electron Configuration: [Kr] 5S₂ 4d10