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What chemical element each period ends with ?​
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What chemical element each period ends with ?​

User Gcarvelli
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Answer:

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).

Step-by-step explanation:

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User Derpyderp
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