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

Explanation

Mg: There are two valence electrons in Mg atom. Hence, the Lewis dot symbol for Mg is: `overset (..)Mg`
Na: There is only one valence electron in an atom of sodium. Hence, the Lewis dot structure is: `Na^(.)`
B: There are 3 valence electrons in Boron atom. Hence, the Lewis dot structure is: `*underset(.)B*`
O: There are six valence electrons in an atom of oxygen. Hence, the Lewis dot structure is: `:overset( ..)O:`
N: There are five valence electrons in an atom of nitrogen. Hence, the Lewis dot structure is: `:overset (..)N^(.)`
Br: There are seven valence electrons in bromine. Hence, the Lewis dot structure is: `:underset(.)overset(..)Br:`