For one of the elements,various successive ionization enthalpies (in $kJ \cdot mol^{-1}$) are given below:

$I.E.$	$1^{st}$	$2^{nd}$	$3^{rd}$	$4^{th}$	$5^{th}$
Value	$577.5$	$1810$	$2750$	$11580$	$14820$

The element is:

The order of ionisation potential between $He^{+}$ ion and $H$ atom (both species are in gaseous state) is

Which of the following electronic configurations represents a sudden large gap between the values of second and third ionisation energies of an element?

Which of the following processes is non-spontaneous?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A:$ The first ionisation enthalpy decreases across a period.
Reason $R:$ The increasing nuclear charge outweighs the shielding across the period.
In the light of the above statements,choose the most appropriate from the options given below:

Which has maximum first ionization potential?