What will be the $IUPAC$ symbol and name for the element with atomic number $123$?

The electronic configuration of an element $M$ is given below: $M: 1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^2 4p^6 4d^{10} 4f^2 5s^2 5p^6 5d^{10} 5f^0 6s^2$. Choose the correct information regarding the element $M$ for its period number,block and group number respectively.

The elements with atomic numbers $Z=117$ and $Z=120$ have not yet been discovered. In which family or group would you place these elements,and what would be their expected electronic configuration?

An element having atomic number $120$ has not yet been discovered. What will be its position in the long form of the periodic table?

Which are the starting elements in periods $1$ to $7$?

In which of the following groups would placing Helium satisfy all its properties?