What is the correct electron configuration for the zirconium (Zr, 40) atom?
(a) [Kr] 5s 1 3d3
(b) [Kr] 5s 2 3d2
(c) [Kr] 4d4
(d) [Kr] 5s1 4d3
(e) [Kr] 5s2 4d2
Answer: (e) [Kr] 5s2 4d2
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