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is cr ionic or covalent
is co ionic or covalent bond
is co ionic or covalent compound
is cr and cl ionic or covalent
cr and cl covalent ionic
is cr2o3 ionic or covalent
cr cr2o7 3 ionic or covalent
is cr2s3 ionic or covalent
is cr a cation or anion
is c ionic or covalent
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