Which of the following statements is incorrect?

The electronic configurations of four elements are:
$I. [Xe] \, 6s^1$
$II. [Xe] \, 4f^{14} \, 5d^1 \, 6s^2$
$III. [Ar] \, 4s^2 \, 4p^5$
$IV. [Ar] \, 3d^7 \, 4s^2$
Select the incorrect statement about these elements.

Fill in the blanks:
$(i)$ Atoms and ions having the same number of electrons are known as ........... .
$(ii)$ The quantitative measure of the tendency of an element to lose an electron is called ........... .
$(iii)$ The screening effect is also known by the name ........... .
$(iv)$ The enthalpy change when a gaseous neutral atom forms a negative ion is called ........... .

Which of the following sets is incorrect?

Match List-$I$ with List-$II$:

List-$I$ (Atomic Number)	List-$II$ (Block of periodic table)
$A$. $37$	$I$. $p$-block
$B$. $78$	$II$. $d$-block
$C$. $52$	$III$. $f$-block
$D$. $65$	$IV$. $s$-block

Choose the correct answer from the options given below:

Fluorine,chlorine,bromine and iodine are placed in the same group $(17)$ of the periodic table,because