MCQ
Choose the incorrect trend in the atomic radii (r) of the elements :
  • A
    $\mathrm{r}_{\mathrm{Br}} < \mathrm{r}_{\mathrm{K}}$
  • B
    $\mathrm{r}_{\mathrm{Mg}} < \mathrm{r}_{\mathrm{Al}}$
  • C
    $\mathrm{r}_{\mathrm{Rb}} < \mathrm{r}_{\mathrm{CS}}$
  • D
    $\mathrm{r}_{\mathrm{At}} < \mathrm{r}_{\mathrm{Cs}}$

Answer

B. $\mathrm{r}_{\mathrm{Mg}}<\mathrm{r}_{\mathrm{Al}}$
In a period from left to right atomic size decreases.

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