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Aleksandr [31]
3 years ago
8

4 points

Chemistry
2 answers:
kogti [31]3 years ago
6 0

Explanation:

groups are the vertical rows of element and each group have the same no of valence electron

periods are the horizontal row of element on the basis of no of orbital

Ilya [14]3 years ago
4 0

The vertical columns are groups

The horizontal rows are periods

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Answer:

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