The element having the electronic configuration of [Kr]5s24d5 is:
Correct answer: B. Tc43
- A. Sr³⁸
- B. Tc43
- C. Ru¹⁰¹
- D. Pd⁴⁶
Explanation
Calculate the total number of electrons: 36 (from Kr) + 2 + 5 = 43 electrons. Identify the element: The element with 43 electrons is technetium (Tc).
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About Electronic Configuration
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
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