Identify the group and valency of the element having atomic number $119$. Also,predict the outermost electronic configuration and write the general formula of its oxide.

(A) The atomic number of the element is $119$.
According to the periodic table,elements with atomic numbers $87$ $(Fr)$ to $118$ $(Og)$ complete the $7th$ period.
The element with atomic number $119$ will be the first element of the $8th$ period.
It belongs to Group $1$ (Alkali metals).
Its outermost electronic configuration is $8s^{1}$.
Since it belongs to Group $1$,its valency is $1$.
The general formula of its oxide is $M_{2}O$ (where $M$ is the element).