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

Mg: There are two valence electrons in Mg atom. Hence, the Lewis dot symbol for Mg is: $\ddot{M}_{g}$

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: ${ }^{\circ} \cdot{B} \cdot$

Q: There are six valence electrons in an atom of oxygen. Hence, the Lewis dot structure is: $\ddot{o}:$

$\underline{N}$ : There are five valence electrons in an atom of nitrogen. Hence, the Lewis dot structure is: $: \ddot{N}^{*}$

Br: There are seven valence electrons in bromine. Hence, the Lewis dot structure is: :\ddot{:r: }