Which element among the following is most probable to have the following values?
$\Delta_i H_1 = 419 \ kJ \ mol^{-1}$
$\Delta_i H_2 = 3051 \ kJ \ mol^{-1}$
$\Delta_{eg} H = -48 \ kJ \ mol^{-1}$

Given below are two statements:
Statement-$I$: The correct order in terms of atomic/ionic radii is $Al > Mg > Mg^{2+} > Al^{3+}$.
Statement-$II$: The correct order in terms of the magnitude of electron gain enthalpy is $Cl > Br > S > O$.
In the light of the above statements, choose the correct answer from the options given below:

Which property decreases from left to right across the periodic table and increases from top to bottom?
$(i)$ Atomic radius
$(ii)$ Electronegativity
$(iii)$ Ionisation energy
$(iv)$ Metallic character

Which of the following properties does not depend on periodicity?

The statement that is not correct for the periodic classification of elements is

Identify the correct statements from the following.
$(i)$ In the periodic table,about $78 \%$ of elements are metals.
$(ii)$ In a group,the metallic character decreases from top to bottom and in a period the nonmetallic character decreases from left to right.
$(iii)$ The element $Ho$ belongs to $f-$block.