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The atom is made up essentially of the nucleus and orbitals. The electrons revolve around the nucleus within these orbitals. Writing the configuration depends on how you want to put it forth. If you want to go with the Bohr's model, here's how it is:

The electrons move in specific orbits, which are denoted by K, L, M, N, etc. the first shell is the K-shell. It can hold only two electrons. After this, every shell (L, M, N) can hold upto 8 electrons each. So, for the element Oxygen (O8), the configuration will be : K=2, L=6. For Argon (Ar18), it will be: K=2, L=8, M=8

If you want to go with the more accurate orbital model, here's how it is:

The electrons move around the nucleus in their shells. These shells have subshells and orbitals. The name of the shell is denoted by its number. The shell closes to the nucleus is 1, the next 2, the next 3 and so on. The subshells may be s, p, d or f. Then, the number of electrons present in each subshell is denoted in supersript. Each subshell has different orbitals, each of which can hold two electrons, and the shells have one subshell more at every step(based on the azimuthal quantum numbers) So, for Oxygen, it wil be: 1S2 2S2 2P2 and for Argon, it is 1S2 2S2 2P6 3S2 3P6


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14y ago
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11y ago

The f block elements are the lanthanides and actinides. Refer to the related link below to see a printable Periodic Table that includes electron configurations.

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12y ago

no , it has five faces.

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Q: What are the rules in writing electron configuration?
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