The $39^{t h}$ electron will go into which one of the following sub-levels?

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5 s

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Solution

The correct option is A 4d
The 39th electron will go into 4d sub-level.
Kr has Z =36. Its electronic configuration is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6}$ .
37th and 38th electron will go into 5s sub-level and 39th electron will go into 4d sub level.

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