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How many elements are in the first row of the periodic table? How many are in the second and third rows?

How many elements are in the first row of the periodic table? How many are in the second and third rows?
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How many elements are in the first row of the periodic table? How many are in the second and third rows?

How many elements are in the first row of the periodic table? How many are in the-example-1
User Emiliya
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I think it is 7 in the first row and 6 in the second. I am very sorry if wrong :D
User Gumeo
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