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Anionic Radius

Which one of ...

Question

Which one of the following is the smallest in size?

A

N^{3 -}

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B

O^{2 -}

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C

F^{-}

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D

N a^{+}

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Solution

The correct option is D $N a^{+}$
Here, all four species are isoelectronic.
We know,
In an Isoelectronic species as the effective nuclear charge increases size decreases.
Here $N a^{+}$ is having most protons so it will be having highest nuclear charge, thus smallest size.

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Similar questions

Q. Among the following, the isoelectronic species is/ are:
(i)

O^{2 -}, F^{-}, N a^{+}, M g^{2 +}

N a^{+}, M g^{+}, A l^{3 +}, F^{-}

N^{3 -}, O^{2 -}, F^{-}, N e

Q. Arrange the following in the increasing order of ionic size.

N^{3 -}, N a^{+}, F^{-}, O^{2 -}, M g^{2 +}

Question 20

In which of the following pairs, the ions are isoelectronic ?

(a) $N a^{+}, M g^{2 +}$ (b) $A l^{3 +}, O^{-}$ (c) $N a^{+}, O^{2 -}$ (d) $N^{3 -}, C l^{-}$

Q. Which of the following

N^{3 -}, O^{2 -}, F^{-}

is largest in size?

Q. Arrange the following as stated :
Increasing order of ionic size

N^{3 -}, N a^{+}, F^{-}, O^{2 -}, M g^{2 +}

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