A) \[4,1,-1,\frac{1}{2}\]
B) \[4,0,0,\frac{1}{2}\]
C) \[3,2,-2,\frac{1}{2}\]
D) \[3,\,2,\,2,\frac{1}{2}\]
Correct Answer: B
Solution :
19th electron goes to 4s energy level. The electronic configuration of Cr in the order of filling up of electrons is \[1{{s}^{2}}\text{ 2}{{s}^{2}}\text{ }2{{p}^{6}}\text{ }3{{s}^{2}}\text{ }3{{p}^{6}}\text{ }4{{s}^{2}}\text{ }3{{d}^{4}}.\] Hence, the correct option is [b].
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