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In the simplified electron-configuration notation, what is the electron configuration of a proton (p+)?
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9. Electrons in Atoms and the Periodic Table
The Electron Configuration (Simplified)
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Which electron configuration corresponds to a neutral boron atom (atomic number 5) in the simplified orbital notation?
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Identify the atomic number of boron, which is 5. This means a neutral boron atom has 5 electrons to place in orbitals.
Recall the order in which orbitals are filled according to the Aufbau principle: first fill the 1s orbital, then the 2s orbital, and then the 2p orbitals.
Fill the 1s orbital with 2 electrons, since it can hold a maximum of 2 electrons: \(1\,s^{2}\).
Next, fill the 2s orbital with 2 electrons, also fully occupied: \(2\,s^{2}\).
Finally, place the remaining 1 electron in the 2p orbital: \(2\,p^{1}\). Combine these to write the full electron configuration as \(1\,s^{2} 2\,s^{2} 2\,p^{1}\).
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