Multi-Electron Configurations and Orbital Diagrams
Which of the ...
Question
Which of the following pairs of species (atoms/ions) will have identical ground state electronic configuration?
A
Li+andHe−
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B
Cl−andAr
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C
NaandK
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D
F+andNe
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Solution
The correct option is BCl−andAr Species with the same number of electrons will have identical electronic configuration. Li+ = 1s2 and He− = 1s22s1 Cl− = 1s22s22p63s23p6 Ar=1s22s22p63s23p6 Na=1s22s22p63s1 K=1s22s22p63s23p64s1 F+ = 1s22s22p4 Ne=1s22s22p6
Hence, Cl−andAr have the same electronic configuration.