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MDCAT Chemistry QUESTION #7818
Question 1

Which element has the electron configuration [Kr] 5s² 4d²?

  • Mo
  • Se
  • Sr
  • Zr✔️
Correct Answer Explanation

Zirconium (Zr, atomic number 40): [Kr] 5s² 4d². Mo: [Kr] 5s¹ 4d⁵ (exception); Se: [Ar] 3d¹⁰ 4s² 4p⁴; Sr: [Kr] 5s².