Question

Assuming that the seventh period is $32$ members long, what should be the atomic number of the noble gas following radon $\left(Rn\right)$?

• A. $120$
• B. $118$
• C. $116$
• D. $122$

Answer 1

Answer: (B)

$118$

The atomic number of $Rn$ is $86$.
The atomic number of the noble gas following Rn will be $86+32=118$.
The alkali metal following francium $\left(Fr\right)$ has $Z=119$,