Electron configuration
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The document discusses electron configurations, which describe the arrangement of electrons in an atom's orbitals. It notes that electrons occupy specific orbitals and that orbitals are grouped into shells. It then provides examples of the full and abbreviated electron configurations for the first 20 elements, showing how many electrons occupy each orbital. The document also outlines the steps for writing abbreviated electron configurations using the noble gas of the same period.
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![Abbreviated electron configuration
Follow these steps to write abbreviated electron
configurations.
Step 1:Find the symbol for the element on a
periodic table.
Step2: Find the symbol for the closest noble gas
the is located in one row above and put the
symbol in square bracket.
For example for iron the closest noble gas will be
[Ar]](https://image.slidesharecdn.com/electronconfiguration-170222170035/85/Electron-configuration-10-320.jpg)
![Step3: Continue writing electron
configuration starting with the period
number of the element followed by s.
For iron abbreviated electron
configuration will be
[Ar]4s2
3d6
18 + 2+ 6= 26](https://image.slidesharecdn.com/electronconfiguration-170222170035/85/Electron-configuration-11-320.jpg)
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Electron configuration
- 1. Electron Configuration An atom’s electron configuration is a shorthand notation that shows the number and arrangement of electrons in its orbitals.
- 2. Bohr-Rutherford diagram for sodium Each circle is known as an orbit. They are numbered 1,2,3….. There are obribitals located in each orbit.
- 3. Orbit Orbital Electron holding capacity 1 s s=2 2 s,p p=6 3 s,p,d d=10 4 s,p,d,f f=14
- 5. Element Electron configuration 1.Hydrogen 1s1 2.Helium 1s2 3.Lithium 1s2 2s1 4.Beryllium 1s2 2s2
- 6. 5.Boron 1s2 2s2 2p1 6.Carbon 1s2 2s2 2p2 7.Nitrogen 1s2 2s2 2p3 8.Oxygen 1s2 2s2 2p4
- 7. 9.Fluorine 1s2 2s2 2p5 10. Neon 1s2 2s2 2p6 11.Sodium 1s2 2s2 2p6 3s1 12.Magnesium 1s2 2s2 2p6 3s2 13.Aluminum 1s2 2s2 2p6 3s2 3p1
- 8. 14.Silicon 1s2 2s2 2p6 3s2 3p2 15.Phosphorous 1s2 2s2 2p6 3s2 3p3 16.Sulfur 1s2 2s2 2p6 3s2 3p4 17.Chlorine 1s2 2s2 2p6 3s2 3p5
- 9. 18.Argon 1s2 2s2 2p6 3s2 3p6 19.Potassium 1s2 2s2 2p6 3s2 3p6 4s1 20. Calcium 1s2 2s2 2p6 3s2 3p6 4s2
- 10. Abbreviated electron configuration Follow these steps to write abbreviated electron configurations. Step 1:Find the symbol for the element on a periodic table. Step2: Find the symbol for the closest noble gas the is located in one row above and put the symbol in square bracket. For example for iron the closest noble gas will be [Ar]
- 11. Step3: Continue writing electron configuration starting with the period number of the element followed by s. For iron abbreviated electron configuration will be [Ar]4s2 3d6 18 + 2+ 6= 26