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  4. An element with atomic number 21 is a

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Q. An element with atomic number $21$ is a

KCETKCET 2008Classification of Elements and Periodicity in Properties

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.