MCQ
Radius of the isoelectronic species
- AIncreases with the increase of nuclear charge
- ✓Decreases with the increase of nuclear charge
- CIs the same for all
- DFirst increases and then decreases
✓
Answer
Correct option: B.
Decreases with the increase of nuclear charge
b
An isoelectronic series is a group of ions that all have the same number of electrons. For example, one isoelectronic series could include $O ^{2-}, F ^{-}, Na ^{+}, Mg ^{2+}$. These all have ten electrons.The number of protons, though, increases as atomic number increases, so nuclear charge increases. When we consider effective nuclear charge then, the ions of greater nuclear charge attract those ten electrons more strongly and pull them in more tightly. Therefore, the radii of the ions in an isoelectronic series decrease as nuclear charge (or atomic number) increases.
An isoelectronic series is a group of ions that all have the same number of electrons. For example, one isoelectronic series could include $O ^{2-}, F ^{-}, Na ^{+}, Mg ^{2+}$. These all have ten electrons.The number of protons, though, increases as atomic number increases, so nuclear charge increases. When we consider effective nuclear charge then, the ions of greater nuclear charge attract those ten electrons more strongly and pull them in more tightly. Therefore, the radii of the ions in an isoelectronic series decrease as nuclear charge (or atomic number) increases.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The acidic hydrolysis of ether $( X )$ shown below is fastest when :
→A $1\, M$ solution of glucose reaches dissociation equilibrium according to equation given below $6HCHO$ $\rightleftharpoons$ ${C_6}{H_{12}}{O_6}$. What is the concentration of $HCHO$ at equilibrium if equilibrium constant is $6 \times {10^{22}}$
→Which of the following will show optical isomerism ?
is
Correct increasing order for the wavelength of absorption in the visible region for the complexes of $CO ^{3+}$ is :
→The half life for the reaction ${N_2}{O_5}$ $\rightleftharpoons$ $2N{O_2} + \frac{1}{2}{O_2}$ in $24\,hrs$ at ${30\,^o}C$. Starting with $10\,g$ of ${N_2}{O_5}$ how many grams of ${N_2}{O_5}$ will remain after a period of $96$ hours ........... $g$
→Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified $KMnO_4$ for complete oxidation?
→The ionic radii of $\mathrm{K}^{+}, \mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Mg}^{2+}$ are in the order:
→$KMn{O_4}$ reacts with ferrous sulphate according to the equation
→$MnO_4^ - + 5F{e^{2 + }} + 8{H^ + } \to M{n^{2 + }} + 5F{e^{3 + }} + 4{H_2}O$
Here $10\,ml$ of $0.1\,M$ $KMn{O_4}$ is equivalent to
Rate of reaction is given by following rate law $ - \frac{{d\left[ c \right]}}{{dt}} = \frac{{{k_1}\,\left[ c \right]}}{{1 + {k_2}\,\left[ c \right]}}$ order of reaction when concentration is verh high
→