Multiple Choice
What is the ground-state electron configuration of iron (Fe, atomic number 26) using noble-gas shorthand?
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9. Electrons in Atoms and the Periodic Table
The Electron Configuration (Simplified)
Multiple Choice
What is the ground-state electron configuration of aluminum (Al, atomic number 13) using noble-gas shorthand?
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Verified step by step guidance1
Identify the atomic number of aluminum (Al), which is 13. This means aluminum has 13 electrons to place in its electron configuration.
Recall the order of filling electron orbitals based on the Aufbau principle: 1s, 2s, 2p, 3s, 3p, and so on.
Write the full electron configuration for aluminum by filling orbitals in order until you reach 13 electrons: 1s² 2s² 2p⁶ 3s² 3p¹.
Use the noble-gas shorthand by replacing the configuration of the previous noble gas with its symbol. The noble gas before aluminum is neon (Ne), which has 10 electrons: 1s² 2s² 2p⁶.
Express the electron configuration of aluminum using the noble-gas shorthand as \([\mathrm{Ne}]\,3s^{2}\,3p^{1}\).
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