The electron configuration of a ground-state Cr atom 1s22s22p63s23p64s13d5.
The distribution of electrons in an element's atomic orbitals is described by the element's electron configuration. Atomic electron configurations adhere to a standard nomenclature in which all atomic subshells that contain electrons are arranged in a sequence with the count of electrons they each hold expressed in superscript.
The atomic number Cr is 24. it has 24 electrons so the electronic configuration of [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1} 3d^{5} .[/tex]
Therefore, the electron configuration of a ground-state Cr atom [tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{1} 3d^{5} .[/tex]
Hence, the correct answer will be option (e).
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