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Types of Unit Cell

The radius of...

Question

The radius of $N a^{6}$ ion is 95 pm and that of Cl ions is 181'pm. Predict whether the Co-ordination number of $N a^{4}$ ion is 6 or 4.

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Solution

Given, radius of $N a^{+} (r_{+}) = 95 p m$

Radius of $C l^{-} (r_{-}) = 181 p m$

We know that,

$R a d i u s r a t i o = \frac{R a d i u s o f c a t i o n (r_{+})}{R a d i u s o f a n i o n (r_{-})}$

$= \frac{95}{181} = 0.523$
This value lies between $0.414 - 0.732$ range, so the coordination number of $N a$ will be $6$ as predicted by radius ratio rule.

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N a^{+}

95

C l^{-}

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N a^{+}

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The radius of Na⁺ ion is 95pm and that of Cl^- ion is 181pm. Predict whether the coordination number of Na⁺ ion is 6 or 4 ?

N a^{+}

95

C l^{-}

181

N a^{+}

C l^{-}

N a^{+}

S^{2 -}

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C l^{-}

181

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