A, B, C, D and E are elements with atomic num | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The elements and their atomic numbers are: $A(13)$,$B(11)$,$C(9)$,$D(7)$,$E(16)$.To achieve the nearest inert gas configuration,these elements for

Vedclass · Accepted Answer

$D, A$

Vedclass · Answer

(A) The elements and their atomic numbers are: $A(13)$,$B(11)$,$C(9)$,$D(7)$,$E(16)$.To achieve the nearest inert gas configuration,these elements form the following ions:$A^{3+}$ ($10$ electrons),$B^+$ ($10$ electrons),$C^-$ ($10$ electrons),$D^{3-}$ ($10$ electrons),$E^{2-}$ ($18$ electrons).For isoelectronic ions $(A^{3+}, B^+, C^-, D^{3-})$,the ionic size increases as the nuclear charge $(Z)$ decreases.$Z$ values are: $A=13, B=11, C=9, D=7$.Since $D$ has the lowest $Z$ $(7)$,$D^{3-}$ has the largest size among the isoelectronic series.Comparing $D^{3-}$ $(Z=7)$ and $E^{2-}$ $(Z=16)$: $D^{3-}$ has $10$ electrons in the $n=2$ shell,while $E^{2-}$ has $18$ electrons in the $n=3$ shell. Thus,$D^{3-}$ is larger than $E^{2-}$.Therefore,$X = D$.For the smallest size,we compare the ions. $A^{3+}$ has the highest nuclear charge $(Z=13)$ among the $10$-electron species,making it the smallest among them. $E^{2-}$ $(Z=16)$ has more shells $(n=3)$,making it larger than $A^{3+}$.Therefore,$Y = A$.Thus,$X$ and $Y$ are $D$ and $A$ respectively.

Similar Questions

From the given set of species,point out the species from each set having the least atomic radius.
$A. F^{-}, Na^{+}, Mg^{+2}$
$B. Ni, Cu, Zn$
$C. N^{-3}, Cs^{+}, H^{-}$
$D. Li, He, Be^{+2}$

The correct order of radii is

In the main group elements $(i)$ as we proceed down the same group in the periodic table and $(ii)$ as we proceed from left to right in the same period,the atomic radius

The ions $S^{2-}, Cl^{-}, K^{+}, Ca^{2+}$ are isoelectronic. Their ionic radii show

The correct order of the decreasing ionic radii among the following isoelectronic species is

Vedclass Test Series

Exam Paper Generator

Online Exam Module