Give the correct order of initials $\mathrm{T}$ (true) or $\mathrm{F}$ (false) for following statements :-
$\left(\mathrm{I}\right)$ If an ion has $2$ electrons in $\mathrm{K}$ shell, $8$ electrons in $\mathrm{L}$ shell and $6$ electrons in $\mathrm{M}$ shell, then number of $\mathrm{S}$ electrons present in that element is $6.$

$\left(\mathrm{II}\right)$ The maximum number of electrons in a subshell is given by $2{\mathrm{n}}^2$
$\left(\mathrm{III}\right)$ If electron has magnetic quantam number $-1,$ then it cannot be present in $\mathrm{s}-$orbital.
$\left(\mathrm{IV}\right)$ Only one radial node is present in $3\mathrm{p}$ orbital.

An electron in a hydrogen atom in its ground state absorbs energy equal to ionisation energy of ${\mathrm{Li}}^{+2}.$ The wavelength of the emitted electron is :-

Given: Planck's constant $=6.62\times {10}^{-34}\mathrm{Js}$, mass of electron $=9.1\times {10}^{-31}\mathrm{kg}$, Ionisation energy of hydrogen ${\mathrm{IE}}_{\mathrm{H}}=2.18\times {10}^{-19}\mathrm{J}/\mathrm{atom}$

The correct order of decreasing energy of these electrons is :

Consider the following nuclear reactions involving $\mathrm{X} \& \mathrm{Y}.$

$\mathrm{X}⟶\mathrm{Y}+{}_2{}^4\mathrm{He}$

$\mathrm{Y}⟶{{}_8\mathrm{O}}^{18}+{{}_1\mathrm{H}}^1$

If both neutrons as well as protons in both the sides are conserved in nuclear reaction then identify period number of $\mathrm{X} \&$ moles of neutrons in $4.6 \mathrm{g}$ of $\mathrm{X}$