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Kallie Delacruz
Chemistry
17 October, 05:48
What chemical element each period ends with?
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Colin
17 October, 06:09
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The periods are numbered 1 through 7 on the left-hand side of the table. Elements that are in the same period have chemical properties that are not all that similar. Consider the first two members of period 3: sodium (Na) and magnesium (Mg).
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