Molecular Structure type, The ionic radii of Rb + and I

Molecular Structure type

The ionic radii of Rb⁺ and I^- respectively are 1.46 Å and 2.16Å. The very most probable type of structure exhibited by it is: (a) CsCl type (b) ZnS type (c) Nacl type (d) CaF₂ type

Answer: (c) (r_C⁺)/(r_a^-) = 1.46/2.16 = 0.676
It permits co-ordination number 6 and octahedral structure of type Nacl.

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