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In the [[periodic table]] of the [[Chemical element|elements]], a [[period (periodic table)|period]] is a horizontal row of the table.

The elements are  laid out in a series rows so that those with similar properties line up in horizontal columns: this reflects the periodic recurrence of similar properties as the [[atomic weight]] increases.

Modern [[quantum mechanics]] explains these periodic trends in properties in terms of [[electron shell]]s. As [[atomic number]] increases, electron shells are filled in roughly this order. The filling of each shell corresponds to a row in the table.

 1s 
 2s          2p  
 3s          3p  
 4s       3d 4p  
 5s       4d 5p
 6s    4f 5d 6p  
 7s    5f 6d 7p  
       6f 7d    7f
 
 ...  

Hence the structure of the periodic table. Since the [[valence electrons]] determine chemical properties, those tend to be similar within [[periodic table group]]s. 

Elements adjacent to one another within a group have similar physical properties, despite their significant differences in mass. Elements adjacent to one another within a period have similar mass but different properties.

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[[Category:Periodic table]]

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[[fi:Jakso (jaksollinen järjestelmä)]]
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[[vi:Chu kỳ tuần hoàn]]
[[zh:元素周期]]
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