A) halogen
B) representative element
C) transition element
D) alkali metal
Correct Answer: C
Solution :
The electronic configuration of element with atomic number 21 is \[1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{1}}\] Since, this element contains partly filled d-orbital, so it is a d-block element, d-block elements are also known as transition elements.
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