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I came across an electronic configuration diagram, it had three shells. The first shell had only one electron, the second had six and the third energy shell had five. An electron was also present outside all the shells.

Is this configuration possible?

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    $\begingroup$ Share a picture. $\endgroup$
    – AChem
    May 2, 2020 at 14:08

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Yes, it is possible. When an element is excited, some electrons from lower shell jumps to higher shells. For eg, in-ground state suppose an element has electronic configuration $\ce{(1s)^2 (2s)^2 (2p)^5}$ . If we energize it, then some of the electrons jump up for a short period of time(till the energy is available) . The config becomes $\ce{(1s)^2 (2s)^1(2p)^6 }$.

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  • $\begingroup$ Jdeep's information is not an answer to the question. Hazika would like to discuss an excited state whose configuration does not differentiate between $s$ and $p$ shells. This configuration could be described by the unusual electronic configuration $\pu{1^1}$ $\pu{2^6}$ $\pu{3^5}$ This would be a highly excited state, because $1$ electron is missing on the level $\pu{n = 1}$, and $2$ electrons are missing on the level $\pu{n = 2}$. $\endgroup$
    – Maurice
    May 25, 2021 at 19:03

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