Q10 / 160 · TS EAMCET 2005 · Chemistry

The atomic numbers of elements $X, Y$ and $Z$ are 19, 21 and 25 respectively. The number of electrons present in the $M$-shell of these elements follow the order

  • A
    $Z>X>Y$
  • B
    $X>Y>Z$
  • Correct answer
    C
    $Z>Y>X$
  • D
    $Y>Z>X$

Solution

Figure
Hence, the order of number of electrons in M shell is : $$ Z>Y>X $$

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

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