What is the electron configuration for Kr?
A) 1s22s22p63s23p43d104s24p6
B) 1s22s22p63s23p64s23d24p6
C) 1s22s22p63s23p64s23d104p6
D) 1s22s22p63s23p24s23d104p6
E) none of the above
Answer: C
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