Periodicity in Properties

The ions  ${\mathrm{O}}^{2-},{\mathrm{F}}^{-},{\mathrm{Na}}^{+},{\mathrm{Mg}}^{2+}\mathrm{and}{\mathrm{Al}}^{3+}$ are isoelectronic. Their ionic radii show:

The atomic number of Vanadium $\left(\mathrm{V}\right)$, Chromium $\left(\mathrm{Cr}\right)$, Manganese $\left(\mathrm{Mn}\right)$ and Iron $\left(\mathrm{Fe}\right)$ are, respectively, $23, 24, 25 \mathrm{and} 26$. Which one of these may be expected to have the highest second ionization enthalpy?

Assertion. ${\mathrm{Na}}^{+}$ and ${\mathrm{Al}}^{3+}$ are isoelectronic but the magnitude of the ionic radius of ${\mathrm{Al}}^{3+}$ is less than that of ${\mathrm{Na}}^{+}$ .

Reason. The magnitude of effective nuclear charge of the outer shell electrons in ${\mathrm{Al}}^{3+}$ is greater than in ${\mathrm{Na}}^{+}$ .

The atomic radii of $\mathrm{Li}, \mathrm{F}, \mathrm{Na}$ and $\mathrm{Si}$ follow the order:

Among ${\mathrm{P}}_2{\mathrm{O}}_5,{\mathrm{As}}_2{\mathrm{O}}_3,{\mathrm{Sb}}_2{\mathrm{O}}_3$ and ${\mathrm{Bi}}_2{\mathrm{O}}_3,$ the most acidic oxide is
 

The first ionisation energy of $\mathrm{Na},\mathrm{B},\mathrm{N}$ and $\mathrm{O}$ atoms follows the order
 

The successive ionization energies of an element, in $\mathrm{kJ}·{\mathrm{mol}}^{-1}$ are $1060,1900, 2920, 6280$ and $21200.$ This element would belong to group- $\underline{ }$

Which order among the following is incorrect ?

Which element among the following is most probable to have the following values?

${\mathrm{\Delta }}_{\mathrm{i}}{\mathrm{H}}_1=419 \mathrm{kJ}{ \mathrm{mol}}^{-1}$
${\mathrm{\Delta }}_{\mathrm{i}}{\mathrm{H}}_2=3051 \mathrm{kJ}{ \mathrm{mol}}^{-1}$
${\mathrm{\Delta }}_{\mathrm{eg}}\mathrm{H}=-48 \mathrm{kJ}{ \mathrm{mol}}^{-1}$

Identify the correct order of ionic radii of the given species:

Which among the following iso-electronic species has the smallest size?
${\mathrm{O}}^{2-}, {\mathrm{F}}^{-}, \mathrm{Ne}, {\mathrm{Na}}^{+}, {\mathrm{Mg}}^{2+}, {\mathrm{Al}}^{3+}, {\mathrm{Si}}^{4+}$

The ions ${\mathrm{S}}^{2-}, {\mathrm{Cl}}^{-}, {\mathrm{K}}^{+}, {\mathrm{Ca}}^{2+}$ are iso-electronic. Their ionic radii show $\_\_\_\_\_\_\_$

Identify the incorrect order corresponding the mentioned property?

Arrange $\mathrm{B}\mathrm{e},\mathrm{}\mathrm{M}\mathrm{g},\mathrm{}\mathrm{C}\mathrm{a},\mathrm{}\mathrm{S}\mathrm{r}$ in the ascending order of ionisation enthalpy.

Which one is the correct order of the size of the iodine species ?

The correct arrangement of basic strength is