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The Periodic table has all of the information needed to draw the Lewis Dot Structure. Each group, or column, is indicated by roman numeral which represents the number of valence electrons. This is applicable to entire group. For example, all elements which fall within the first column, or Group I, have one valence electron. All elements in Group II have two valence electrons, all way up to VIII, eight valence electrons. Properties are also consistent across rows, or periods, of periodic table. Periods are indicated by number, 1 2 3, etc. Which represents the energy level, or shell of electrons. The First Period, or row, has only one energy level that can hold a total of two electrons. Period 2, with a second shell, can hold a total of eight electrons, also know as the octet rule. Period 3 and so forth can hold more than eight electrons. Periodic tables also convey electronegativity. Most electronegative elements are located in uppermost right corner of the period table and decrease in electronegativity as you go down Group or more left of period. Throughout drawing Lewis Dot structures, periodic table will be a strong reference point when working with electrons, covalent bonding, and polyatomic ions.
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