Hydrogen has one electron, which is located in the first energy shell. Helium has two electrons in the first energy shell. Lithium has three electrons—two in the first energy shell and one in the second. How might this pattern be related to the fact that hydrogen and lithium are both reactive, but helium is unreactive?

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answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

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