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

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 of the following statements related to the modern periodic table is incorrect?
$(a)$ The $p$-block has $6$ columns,because a maximum of $6$ electrons can occupy all the orbitals in a $p$-shell.
$(b)$ The $d$-block has $8$ columns,because a maximum of $8$ electrons can occupy all the orbitals in a $d$-subshell.
$(c)$ Each block contains a number of columns equal to the number of electrons that can occupy that subshell.
$(d)$ The block indicates value of azimuthal quantum number $(l)$ for the last subshell that received electrons in building up the electronic configuration.

The long form of the periodic table is based on:

Which of the following statements is incorrect?

Who developed the long form of periodic table?