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4 March, 21:43

When traveling from oxygen to sulfur to selenium, through this group in the periodic table, what is changing?

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  1. 4 March, 22:03
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    Horizontal rows are called periods. As you travel downwards, the period is changing. (Oxygen in period 2, sulfur in period 3, and selenium in period 4)
  2. 4 March, 22:12
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    I had that same question
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