Figure 1 the current element.Period (Period), the horizontal alignment of the table elements that each element in the same period by the order of atomic number from left to right, and from low to high. Where are all the elements that are in the period of 7 lessons at the same level with the same energy, which is energy level (n) is equal to the period. Moo (Group) to arrange the elements in a table element by the vertical elements in each period, there will be 8 Moo Moo number that it will be equal to the number of electrons in the outermost energy level (Valence Electron).
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