Rows
The periodic table is divided into seven rows. These rows are also referred to as periods. Elements that share a period are similar to each other, but not as similar to elements within the same group or family. Elements within the same period as each other contain the same amount of shells on which electrons lie.
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Other Resources on Rows of the Periodic Table
Explanatory Video
Web Resources
http://www.chem4kids.com/files/elem_pertable.html
http://chemistry.about.com/od/k12gradelessons/a/periodictable_2.htm
http://www.dummies.com/how-to/content/the-periodic-table-families-and-periods.html
http://chemistry.about.com/od/k12gradelessons/a/periodictable_2.htm
http://www.dummies.com/how-to/content/the-periodic-table-families-and-periods.html
Image Sources:
http://www.chem4kids.com/files/art/elem_pertable2.gif
http://4.bp.blogspot.com/-34TUkUQ_s5U/TywUjhJby4I/AAAAAAAAALQ/_hYxUve1hW8/s1600/periods.jpg
http://www.chem4kids.com/files/art/elem_pertable2.gif
http://4.bp.blogspot.com/-34TUkUQ_s5U/TywUjhJby4I/AAAAAAAAALQ/_hYxUve1hW8/s1600/periods.jpg