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6 September, 13:33

What do the horizontal lines represent in periodic table?

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  1. 6 September, 13:59
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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.
  2. 6 September, 14:07
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    The horizontal rows in the periodic table are periods while vertical lines are called groups
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