The cause of periodicity of properties is

The $IUPAC$ nomenclature of an element with electronic configuration $[Rn] 5f^{14} 6d^{1} 7s^{2}$ is.

Assign the position of the element having outer electronic configuration in the periodic table:
$(i)$ $ns^{2} np^{4}$ for $n=3$
$(ii)$ $(n-1)d^{2} ns^{2}$ for $n=4$
$(iii)$ $(n-2)f^{7} (n-1)d^{1} ns^{2}$ for $n=6$

To which group of the periodic table does an element having electronic configuration $[Ar] 3d^5 4s^2$ belong?

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

Assuming that elements are formed to complete the $7^{th}$ period,what would be the atomic number of the alkaline earth metal of the $8^{th}$ period?