What is the atomic number of the element with symbol $Uus$?

Which period contains most of the man-made radioactive elements?

If an orbital could contain $3$ $e^-$,the total number of groups in the periodic table would be:

If an atom has electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$,it will be placed in

What is the maximum number of elements possible in a period? Where are they located?

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.