In which block of the periodic table is chromium (Cr) found?

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The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.

You can look it up online and some images should pop up 

Hello there,it will only be somewhat eroded (25%)hope this : ))~top