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Write Lewis dot symbols for atoms of the following elements: Mg, Na, B, O, N, Br. 

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Mg: There are two valence electrons in Mg atom. Hence, the Lewis dot symbol for Mg is: 

Na: There is only one valence electron in an atom of sodium. Hence, the Lewis dot structure is: 

B: There are 3 valence electrons in Boron atom. Hence, the Lewis dot structure is:    O: There are six valence electrons in an atom of oxygen. Hence, the Lewis dot structure is: 

N: There are five valence electrons in an atom of nitrogen. Hence, the Lewis dot structure is: 

Br: There are seven valence electrons in bromine. Hence, the Lewis dot structure is: 

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