(a) Electronegativity generally increases on moving across a period from left to right and decreases from top to bottom in a group as atomic size increases. So, the order of electronegativity is:
\(\mathrm{Si}<\mathrm{P}<\mathrm{C}<\mathrm{N}\)
Karnataka CET 2017
CHEMISTRY(KCET)
285246
The correct arrangement for the ions in the increasing order of their radii is
(b)
\begin{tabular}{|c|c|c|}
\hline Species & At No. & No. of \(\mathrm{e}^{-}\) \\
\hline \(\mathrm{Ca}^{2+}\)
20.18 \\
\hline \(\mathrm{~K}^{+}\)
19.18 \\
\hline \(\mathrm{~S}^{2-}\)
16.18 \\
\hline
\end{tabular}
The species \(\mathrm{Ca}^{2+}, \mathrm{K}^{+}\)and \(\mathrm{S}^{2-}\) are isoelectronic. For isoelectronic ions, the radius decreases as the nuclear charge increases. Hence, the increasing order of their radii is : \(\mathrm{Ca}^{2+}<\mathrm{K}^{+}<\mathrm{S}^{2-}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285245
For one of the element various successive ionization enthalpies (in\(\mathrm{kJ} \mathrm{mol}^{-1}\) ) are given below:
I.E.
1st
2nd
3rd
4th
5th
577.5
1810
2750
11,580
14,820
The element is
1 P
2 Mg
3 Si
4 Al
Explanation:
(d) Large jump between\(\mathrm{IE}_3\) and \(\mathrm{IE}_4\) suggests that the element has three valence electrons.
(a) Electronegativity generally increases on moving across a period from left to right and decreases from top to bottom in a group as atomic size increases. So, the order of electronegativity is:
\(\mathrm{Si}<\mathrm{P}<\mathrm{C}<\mathrm{N}\)
Karnataka CET 2017
CHEMISTRY(KCET)
285246
The correct arrangement for the ions in the increasing order of their radii is
(b)
\begin{tabular}{|c|c|c|}
\hline Species & At No. & No. of \(\mathrm{e}^{-}\) \\
\hline \(\mathrm{Ca}^{2+}\)
20.18 \\
\hline \(\mathrm{~K}^{+}\)
19.18 \\
\hline \(\mathrm{~S}^{2-}\)
16.18 \\
\hline
\end{tabular}
The species \(\mathrm{Ca}^{2+}, \mathrm{K}^{+}\)and \(\mathrm{S}^{2-}\) are isoelectronic. For isoelectronic ions, the radius decreases as the nuclear charge increases. Hence, the increasing order of their radii is : \(\mathrm{Ca}^{2+}<\mathrm{K}^{+}<\mathrm{S}^{2-}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285245
For one of the element various successive ionization enthalpies (in\(\mathrm{kJ} \mathrm{mol}^{-1}\) ) are given below:
I.E.
1st
2nd
3rd
4th
5th
577.5
1810
2750
11,580
14,820
The element is
1 P
2 Mg
3 Si
4 Al
Explanation:
(d) Large jump between\(\mathrm{IE}_3\) and \(\mathrm{IE}_4\) suggests that the element has three valence electrons.
(a) Electronegativity generally increases on moving across a period from left to right and decreases from top to bottom in a group as atomic size increases. So, the order of electronegativity is:
\(\mathrm{Si}<\mathrm{P}<\mathrm{C}<\mathrm{N}\)
Karnataka CET 2017
CHEMISTRY(KCET)
285246
The correct arrangement for the ions in the increasing order of their radii is
(b)
\begin{tabular}{|c|c|c|}
\hline Species & At No. & No. of \(\mathrm{e}^{-}\) \\
\hline \(\mathrm{Ca}^{2+}\)
20.18 \\
\hline \(\mathrm{~K}^{+}\)
19.18 \\
\hline \(\mathrm{~S}^{2-}\)
16.18 \\
\hline
\end{tabular}
The species \(\mathrm{Ca}^{2+}, \mathrm{K}^{+}\)and \(\mathrm{S}^{2-}\) are isoelectronic. For isoelectronic ions, the radius decreases as the nuclear charge increases. Hence, the increasing order of their radii is : \(\mathrm{Ca}^{2+}<\mathrm{K}^{+}<\mathrm{S}^{2-}\)
Karnataka CET 2014
CHEMISTRY(KCET)
285245
For one of the element various successive ionization enthalpies (in\(\mathrm{kJ} \mathrm{mol}^{-1}\) ) are given below:
I.E.
1st
2nd
3rd
4th
5th
577.5
1810
2750
11,580
14,820
The element is
1 P
2 Mg
3 Si
4 Al
Explanation:
(d) Large jump between\(\mathrm{IE}_3\) and \(\mathrm{IE}_4\) suggests that the element has three valence electrons.
