Question:

In the fluorite structure, the coordination number of $ Ca^{2+}$ ion is

Updated On: Jul 12, 2022
  • 4
  • 6
  • 8
  • 3
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The Correct Option is C

Solution and Explanation

In fluorite structure each $Ca^{2+}$ ion is surrounded by eight F" ions. Thus, the coordination number of $Ca^{2+}$ is eight. In fluorite structure each $ {F^{-}}$ ion is surrounded by four $ {Ca^{++}}$ ions whereas each $ {Ca^{++}}$ is surrounded by eight $ {F^{-}}$ ions, giving a body centred cubic arrangement. Thus the coordination number of $ {Ca^{++} = F^{-}}$ are 8 and 4.
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Concepts Used:

Solid State

Solids are substances that are featured by a definite shape, volume, and high density. In the solid-state, the composed particles are arranged in several manners. Solid-state, in simple terms, means "no moving parts." Thus solid-state electronic devices are the ones inclusive of solid components that don’t change their position. Solid is a state of matter where the composed particles are arranged close to each other. The composed particles can be either atoms, molecules, or ions. 

Solid State

Types of Solids:

Based on the nature of the order that is present in the arrangement of their constituent particles solids can be divided into two types;

  • Amorphous solids behave the same as super cool liquids due to the arrangement of constituent particles in short-range order. They are isotropic and have a broad melting point (range is about greater than 5°C).
  • Crystalline solids have a fixed shape and the constituent particles are arranged in a long-range order.