Single Choice

The increasing order of the ionic radii of the given isoelectronic species is:

A$$Cl^{-},Ca^{2+},K^{+},S^{2-}$$
B$$S^{2-},Cl^{-},Ca^{2+},K^{+}$$
C$$Ca^{2+},K^{+},Cl^{-},S^{2-}$$
Correct Answer
D$$K^{+},S^{2-},Ca^{2+},Cl^{-}$$

Solution

An isoelectronic series is useful in understanding the effects of gained or loss electrons on atom size.

If the atom or molecule is negatively charged, as an additional electron occupies an outer orbital, there is increased electron-electron repulsion (and hence, increased shielding) which pushes the electrons further apart. Because the electrons now outnumber the protons in the ion, the protons can not pull the extra electrons as tightly toward the nucleus; this results in decreased $$Z_{eff}$$. Therefore the ionic radii increase whereas it is vice versa when it is positively charged.

The increasing order of the ionic radii of the given isoelectronic species is

$$Ca^{2+},K^{+},Cl^{-},S^{2-}$$

SIMILAR QUESTIONS

Chemical Bonding

Which of the following arrangements represents the increasing order (smallest to largest) of ionic radii of the given species $$O^{2-}, S^{2-}, N^{3-}, P^{3-}$$?

Chemical Bonding

The ionic radii (in $$\mathring{A}$$) of $$N^{3-}$$, $$O^{2-}$$ and $$F^{-}$$ are respectively :

Chemical Bonding

The correct order of decreasing ionic radius among the following anions would be:

Chemical Bonding

Which of the following have the largest ionic size?

Chemical Bonding

The species $$Ar, K^+$$ and $$Ca^{2+}$$ contain the same number of electrons. In which order do their radii increase?

Chemical Bonding

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (i) F$$\displaystyle ^{-}$$ (ii) Ar (iii) Mg$$\displaystyle ^{2+}$$ (iii) Rb$$\displaystyle ^{+}$$

Chemical Bonding

The size of isoelectronic species $$F\displaystyle ^{-}$$, $$Ne$$ and $$Na\displaystyle ^{+}$$ is affected by :

Chemical Bonding

$$K^{+}$$ and $$Cl^{-}$$ ions are isoelectronic. Which of the following statements is not correct?

Chemical Bonding

Which one of the following groups represents a collection of isoelectronic species? (At. nos.: Cs-55, Br-35)

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