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6 November, 12:13

Which of the following groupings contains only representative elements:

a. cu, co, cd or

b. al, mg, li?

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Answers (1)
  1. 6 November, 12:38
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    The correct answer is b. al, mg, li

    That's because Cobalt is not a representative element since it's not found in the first 2 or the last 6 groups.
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