Electronic configuration of K is_________________?
Correct answer: B. [Ar]4s1
- A. [Ar]4s2
- B. [Ar]4s1
- C. [Kr]5s1
- D. [He]2s1
Explanation
Potassium has atomic number 19, so after the argon core containing 18 electrons, its nineteenth electron enters the 4s subshell. Its configuration is [Ar]4s1. Students may choose a by placing two electrons in 4s, but potassium has only one electron beyond the argon core.
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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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