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An element with atomic number 21 is a
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The correct answer is:
transition element
Electronic configuration of element (21) is
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}$
$\therefore$ It is a transition element as its last electron enters in $d$-orbital.
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} 3 d^{1}$
$\therefore$ It is a transition element as its last electron enters in $d$-orbital.
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