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Kcrypon ($36_Kr)$ has the electronic configuration $(_{18}Ar)4s^23d^{10}4p^6$,the $37^{th}$ electron will go into which of the following subshells?

$\begin{array}{1 1}(a)\;4f&(b)\;4d\\(c)\;6p&(d)\;5s\end{array}$

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Follow Aufbau principle (n+l) is minimum for 5s.
Hence (d) is the correct answer.
answered Jan 13, 2014 by sreemathi.v

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