* Electron Configuration: Argon has an atomic number of 18, meaning it has 18 protons and 18 electrons. Its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁶.
* Electron Pairs: Each orbital can hold a maximum of two electrons (due to the Pauli Exclusion Principle). Therefore, each filled s orbital (1s, 2s, 3s) represents one electron pair. Similarly, each filled p orbital (2p, 3p) represents three electron pairs.
* Total Electron Pairs: Adding up the electron pairs from each filled orbital, we get 1 + 1 + 3 + 1 + 3 = 9 electron pairs in an Argon atom.
