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In crystalline solid, atoms, ions or mol...

In crystalline solid, atoms, ions or molecules are held in an orderly array. But some point defect is observed in a crystal, when a vacancy is created by an atom or ion dislocated from its normal position to an interstitial site. What is the defect called?

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a. Frenkel Defect
b. Eight C0rners at 1/8 atomeach to
`=8 xx 1/8=1 atom`
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In a crystalline solid, some point defects is observed when a vacancy is created by an ion missing from its normal position . What is the name of the defects?

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