when xenon absorbs 801 kj/mol of energy, it is excited into a higher-energy state in which the outermost electron has been promoted to the next available subshell. The right electronic configuration for this excited xenon is [Kr] 4d¹⁰5s²5p⁴5d²
The energy required to completely remove the outermost electron from the excited xenon to form excited Xe+ is 369 kJ/mol, and here the energy absorb by the xenon is 801kj/mol which is twice the energy required to remove the 1st excited electron i.e. first ionisation energy, so 801kj/mol is the second ionisation energy of xenon.
The ground state electronic configuration is-
[Kr] 4d¹⁰5s²5p⁶
The excited electronic configuration of xenon is -
[Kr] 4d¹⁰5s²5p⁴5d².
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