SATHEE: Structure of Atom - Result Question 46

Structure of Atom - Result Question 46

####50. The ions $O^{2 -}, F^{-}, N a^{+}, M g^{2 +}$ and $A l^{3 +}$ are isoelectronic. Their ionic radii show [2003]

(a) A decrease from $O^{2 -}$ to $F^{-}$ and then increase from $N a^{+}$ to $A l^{3 +}$

(b) A significant increase from $O^{2 -}$ to $A l^{3 +}$

(d) An increase from $O^{2 -}$ to $F^{-}$ and then decrease from $N a^{+}$ to $A l^{3 +}$

Show Answer

Solution:

(c) Amongst isoelectronic species, ionic radii of anion is more than that of cations. Further size of anion increases with increase in -ve charge and size of cation decreases with increase in + ve charge. Hence, ionic radii decreases from $O^{-}$ to $A l^{3 +}$ .

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Structure of Atom - Result Question 46

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