A) \[1{{s}^{2}},\text{ }2{{s}^{2}}\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}},\text{ }4{{s}^{2}}\]
B) \[1{{s}^{2}},\text{ }2{{s}^{2}}\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}}\text{ }3{{d}^{2}},\text{ }4{{s}^{2}}\]
C) \[1{{s}^{2}},\text{ }2{{s}^{2}}\text{ }2{{p}^{6}},\text{ }3{{s}^{2}},\text{ }3{{p}^{6}}\text{ }3{{d}^{10}},\text{ }4{{s}^{2}}\text{ }4{{p}^{2}}\]
D) \[1{{s}^{2}},\text{ }2{{s}^{2}}\text{ }2{{p}^{6}},\text{ }3{{s}^{2}}\text{ }3{{p}^{6}}\text{ }3{{d}^{10}},\text{ }4{{s}^{2}}\text{ }4{{p}^{1}}\]
Correct Answer: B
Solution :
We know that transition element are those element which have partially filled d-subshells in their elementary form. Therefore, the general electronic configuration of d-block element is \[(n-1){{d}^{1-10}}n{{s}^{1-2}}\]
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