Single Choice

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

A$$O^{2-} < N^{3-} < S^{2-} < P^{3-}$$
Correct Answer
B$$O^{2-} < P^{3-} < N^{3-} < S^{2-}$$
C$$N^{3-} < O^{2-} < P^{3-} < S^{2-}$$
D$$N^{3-} < S^{2-} < O^{2-} < P^{3-}$$

Solution

The correct order representing the increasing trend (smallest to largest) of ionic radii of the given species is $$O^{2-}$$. Since, Sulphur and Phosphorus belongs to 3rd period, their size will be larger than those who belongs to 2nd period like Nitrogen and Oxygen. While comparing the size of $$P^{3-}$$ and $$S^{2-}$$, first we will compare the size of Sulphur and Phosphorus, the size of Phosphorus is greater than Sulphur as the inter nuclear charge increases as we go from left to right in periodic table. On increasing charge, the repulsion increases and hence, the size. The more charge on the atom more will be the atomic radii.

SIMILAR QUESTIONS

Chemical Bonding

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

Chemical Bonding

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

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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