Question

Which of the following statements regarding group $16$ elements is not true?

• A. The electronic configuration of oxygen is $\left[He\right]2s^{2}2p^4$
• B. The atomic radii of the elements of group $16$ is larger than those of the corresponding elements of group $15$
• C. The electronic configuration of sulphur is $\left[Ne\right]3s^{2}3p^4$
• D. The electronic configuration of tellurium is $\left[Kr\right]4d^{10}5s^{2}5p^4$

Answer 1

The correct option is B The atomic radii of the elements of group $16$ is larger than those of the corresponding elements of group $15$

The general electronic configuration of group $16$ elements is $n{s}^{2}n{p}^4.$
Electronic configuration of $O=\left[He\right]2s^{2}2p^4$
Electronic configuration of $S=\left[Ne\right]3s^{2}3p^4$
Electronic configuration of $Se=\left[Ar\right]3d^{10}4s^{2}4p^4$
​​​​​​​Electronic configuration of $Te=\left[Kr\right]4d^{10}5s^{2}5p^4$
​​​​​​​Electronic configuration of $Po=\left[Xe\right]4f^{14}5d^{10}6s^{2}6p^4$
​​​​​​​
When we move across the periodic table, from left to right, the atomic size of the respective elements decreases due to increase in nuclear charge. Therefore, the atomic radii of the elements of group $16$ is smaller than those of the corresponding elements of group $15.$