Based on the aufbau principle and other applicable guiding principles, what electron configuration would one reasonably expect to find for technetium (Z = 43) ?
A) [Kr] 4s2 3d5
B) [Kr] 4s2 4d5
C) [Kr] 4d7
D) [Kr] 5s2 4d5
E) [Kr] 5s2 5d5
Correct Answer:
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