[When coordination number ...] Which is not the correct statement for ionic solids in which positive and negative ions are held by

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Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?

The radius ratio increases as coordination number increases

As the difference in size of ions increases coordination number increases

When coordination number is eight, the radius ratio lies between 0.225 to 0.414

In ionic solid of the type AX (ZnS, Wurtzite) the coordination number of Zn²⁺ and S^2– respectively are 4 and 4

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