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An element with atomic number 21 is a...

An element with atomic number 21 is a

A

Transition elements

B

Alkali metal

C

Halogen

D

Representative element

Text Solution

Verified by Experts

The correct Answer is:
A
The electronic configuration of `._(21)X` is
`._(21)Xrarr1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)3d^(1)`
The last electron enters to d orbital which means it belongs to 'd' block elements or transition elements.
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