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The periodic table of elements is divided into two groups of elements

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The periodic table of elements is divided into two groups of elements. Name those two main groups. 2. In video segment 3B, you are expected to sort periodic table cards and label a blank periodic table. Make sure that you sort the cards while working on video 3B. Which unknowns are gases? 3. As you look down the column of gases, what pattern do you see in the melting point and density?