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A horizontal row in the periodic table is called a <b>period</b>. *There are seven periods numbered from 1 to 7. **The number of the period an element is in, in general, is the same number of the energy level of the elements valence electrons. *Periods 1,2,and 3 are known as short periods. **Atoms of these elements have only s and p electrons *Periods 4 and 5 are long **Contain <i>Transition Elements</i> which is any element with an atom (or a cation) that has an incomplete d subshell *Periods 6 and 7 contain series of transition elements called <i>lanthanoids</i> and <i>actinoids</i> respectively **Both of these are characterized as filling the f sublevel http://library.tedankara.k12.tr/chemistry/vol3/Atomic%20orbitals/h16.jpg [http://wine1.sb.fsu.edu/chm1045/notes/Struct/EPeriod/IMG00011.GIF Another Periodic Table]
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