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Using the periodic table, find the atomic numbers (number of protons) for each element. The atomic numbers are: - Oxygen (O): 8 - Carbon (C): 6 - Hydrogen (H): 1 - Nitrogen (N): 7 - Calcium (Ca): 20 - Phosphorus (P): 15 - Magnesium (Mg): 12 - Potassium (K): 19

Apply the Aufbau principle, Pauli exclusion principle, and Hund's rule along with the periodic table to write the electron configurations for each element: 1. Hydrogen (H) has atomic number 1. Hence, it has 1 electron. Electron configuration: \[1s^1\] 2. Carbon (C) has atomic number 6. Electron configuration: \[1s^2 2s^2 2p^2\] 3. Oxygen (O) has atomic number 8. Electron configuration: \[1s^2 2s^2 2p^4\] 4. Nitrogen (N) has atomic number 7. Electron configuration: \[1s^2 2s^2 2p^3\] 5. Magnesium (Mg) has atomic number 12. Electron configuration: \[1s^2 2s^2 2p^6 3s^2\] 6. Phosphorus (P) has atomic number 15. Electron configuration: \[1s^2 2s^2 2p^6 3s^2 3p^3\] 7. Potassium (K) has atomic number 19. Electron configuration: \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\] 8. Calcium (Ca) has atomic number 20. Electron configuration: \[1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\] In conclusion, the ground-state electron configurations for the eight most abundant elements in the human body are: - Hydrogen (H): \(1s^1\) - Carbon (C): \(1s^2 2s^2 2p^2\) - Oxygen (O): \(1s^2 2s^2 2p^4\) - Nitrogen (N): \(1s^2 2s^2 2p^3\) - Magnesium (Mg): \(1s^2 2s^2 2p^6 3s^2\) - Phosphorus (P): \(1s^2 2s^2 2p^6 3s^2 3p^3\) - Potassium (K): \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^1\) - Calcium (Ca): \(1s^2 2s^2 2p^6 3s^2 3p^6 4s^2\)