Q10 / 180 · COMEDK 2017 · Chemistry

An element with atomic number 21 is a

  • A
    halogen
  • B
    representative element
  • Correct answer
    C
    transition element
  • D
    alkali metal

Solution

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.

Hence, the correct answer is option: 'C'.

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