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What do the horizontal lines represent in periodic table?
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What do the horizontal lines represent in periodic table?

User Ashish Tiwari
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The horizontal rows in the periodic table are periods while vertical lines are called groups
User J Edward Ellis
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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.
User Tobias Punke
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