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4 votes
Observe the Periodic Table.

How many groups (columns) does it have?
How many periods (horizontal rows) does it have?
How are the columns identified?
And the periods?

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User Vicaba
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1 Answer

5 votes

Answer:

Explanation:

well they are arranged in seven horizontal rows called periods or series and i think 18 vertical columns . there called groups and each of the groups are labeled at the top of each column.

answered
User Julien Portalier
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