how we can say that ionic solid are hard and brittle

Dear student!

The ionic crystals are hard because the positive and negative ions are strongly attracted to each other and we require a huge energy  to break the strongest ionic bond and it is difficult to separate the ions, however, when pressure is applied to an ionic crystal then ions of like charge may be forced closer to each other. The electrostatic repulsion can be enough to split the crystal, which is why ionic solids are brittle also.

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in solid state they r not free to move

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YOU  SHOULD JOIN TUTION TO  ME

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you are wrong because in ionic solids there are strong electrostatic forces are present. YOU MUST MUST JOIN TUTION TO ME

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in solid state they r not free to move

due to electrostatic forces

no need to say it strong electrostatic forces

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arre chinamen tu student hai ya teacher

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well u have say they r held closely together by strong electrostatic (coulobic) forces or u wont get marks ! 

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coulombic forces 

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