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Paul [167]
3 years ago
13

Why are atoms arranged in periods ...???

Physics
2 answers:
Andrews [41]3 years ago
7 0
For classification, according to number of shells......
Sati [7]3 years ago
3 0
<span>A horizontal row in the periodic table, which signifies the total number of electron shells in an element's atom. A vertical column in the periodic table, which signifies the number of valence shell electrons in an element's atom.</span>
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Answer:

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Explanation:

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