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a
halogen
b
representative element
c
transition element
d
alkali metal
answer is C.
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Detailed Solution
The electronic configuration of element with atomic number 21 is 1s2,2s2,2p6,3s2,3p6,4s2,3d1. Since, this element contains partly filled d-orbital, so it is a d-block element which are also known as transition elements.