Question

The element, with atomic number $118$, will be

• A. alkali
• B. noble gas
• C. lanthanide
• D. transition element

Answer 1

Answer: (B)

Electronic configuration of element with atomic number $118$ will be $[Rn]5f^{14}6d^{10}7s^{2}7p^6$. Since its electronic configuration in the outer most orbit $\left(n{s}^{2}n{p}^6\right)$ resemble with that of inert or noble gases, therefore it will be noble gas element. The inert gas radon has atomic number $86$. When we add $32$ electrons to it, we get the element with atomic number $118$. In seventh period, a maximum of $32$ electrons can be accommodated. Hence, element with atomic number $118$ is a noble gas.