Single Choice

Which one of the following has largest ionic radius?

A$$Li^+$$
B$$O_{2}^{2-}$$
Correct Answer
C$$B^{3+}$$
D$$F^-$$

Solution

The ionic radii of elements exhibit the same trend as the atomic radii. The atomic size generally decreases across a period for the elements of the second period. It is because, within the period, the outer electrons are in the same valence shell and the effective nuclear charge increases as the atomic number increases resulting in the increased attraction of electrons to the nucleus. The size of an anion will be larger than that of the parent atom because the addition of one or more electrons would result in increased repulsion among the electrons and a decrease in effective nuclear charge.

In given question option A and C are cations in the second period. So they will have less ionic radius than that of the anions o same period. oxygen falls left to the Fluorine and also has one extra negative charge ($$O_2^{-2}$$) than Fluorine ion ($$F^-$$).
Hence, the correct option is $$(B)$$

SIMILAR QUESTIONS

Chemical Bonding

For $$Na^+, Mg^{2+}, F^-$$ and $$O^{2-}$$ the correct order of increasing ionic radii is :

Chemical Bonding

Which of the following will not exist in zwitter ionic form at pH$$=7$$?

Chemical Bonding

Explain why cation are smaller and anions are larger in radii than their parent atoms?

Chemical Bonding

Which of the following is the correct order of size of the given species?

Chemical Bonding

If the ionic radii of $$k^{\displaystyle+}$$ and $$F^{\displaystyle-}$$ are nearly the same (i.e., $$1.34\:\mathring{A}$$), then the atomic radii of $$K$$ and $$F$$ respectively are:

Chemical Bonding

Consider the following statements: I. The radius of an anion is larger than that of parent atom. II. The I.E. increases from left to right in a period generally III. The electronegativity of an element is the tendency of an isolated atom to attract an electron. The correct statements are:

Chemical Bonding

The size of the species $$Pb, Pb^{2+}, and\ Pb^{4+}$$ decreases as:

Chemical Bonding

Which of the following has greater atomic size and why? $$y, y^{+1}, y^{-1}, y^{+2}, y^{-2}$$ Arrange them in ascending order of the atomic size.

Chemical Bonding

When a neutral atom is converted into cation, there is:

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