In the question an electronic configuration diagram is given. It has three shells, but the first shell has only one electron, and the second has six. The third energy shell has five. Out of the shells, also a electron is there.

  • 2
    $\begingroup$ Share a picture. $\endgroup$ – M. Farooq May 2 '20 at 14:08
  • $\begingroup$ After 5 hours of waiting, I still didn't see your diagram! $\endgroup$ – Mathew Mahindaratne May 2 '20 at 19:58
  • $\begingroup$ In others parts of the world it may be sleeping time :-) Hope the OP posts one! $\endgroup$ – M. Farooq May 3 '20 at 3:48

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 $\ce{(1s)^2 (2s)^1(3p)^6 }$.


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