Q77 / 160 · JIPMER 2009 · Chemistry

The atomic number of an element ' $M$ ' is 26. How many electrons are present in the $M$-shell of the element in its $M^{3+}$ state ?

  • A
    11
  • B
    15
  • C
    14
  • Correct answer
    D
    13

Solution

$\begin{array}{l|c|c|c|c} & K & L & M & N \\ \hline M (26) & 1 s^2, & 2 s^2 2 p^6, & 3 s^2 3 p^6 3 d^6 & 4 s^2 \\ M { }^{3+} & 1 s^2, & 2 s^2 2 p^6, & 3 s^2 3 p^6 3 d^5, & 4 s^0 \end{array}$ Hence, 13 electrons are present in the $M$-shell of $M^{3+}$ state.

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

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