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Q.

An element with atomic number 21 is a

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a

Transition element

b

Alkali metal

c

Halogen

d

Representative element

answer is A.

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Detailed Solution

The electronic configuration of  21X is 21X→1s22s22p63s23p64s23d1The last electron enters to d orbital which means it belongs to 'd' block elements or transition elements.
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