Which of the following pairs has both members from the same period of the periodic table?

Which one of the following belongs to the representative group of elements in the periodic table?

Consider the following electronic configuration of an element $(P)$ : $[Xe] 4f^{14} 5d^1 6s^2$. Then,the correct statement about element $P$ is:

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

Atomic numbers of three elements $E_1$,$E_2$ and $E_3$ of the periodic table are $Z_1$,$50$ and $Z_2$ respectively. From the position of the elements shown in the figure,the value of $(Z_2 - Z_1)$ is:

Write the general outer electronic configuration of $s-, p-, d-,$ and $f-$ block elements.