Answer
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Step 1I'll solve this step-by-step following the specified LaTeX and formatting guidelines:
Step 2: Identify the Element
Potassium (K) has the atomic number 19, which means it has 19 protons and 19 electrons in its neutral state.
Final Answer
The electron configuration for K^{-} is 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1}.
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