Question 4.2: Write Lewis symbols for the following elements. a. O, S, and......

a. These elements are all Group VIA elements and thus possess six valence electrons. (The number of valence electrons and the periodic-table group number will always match for representative elements.) The Lewis symbols, which all have six “dots,” are
\quad\quad\quad \cdot\overset{\cdot\cdot}{\underset{\cdot}{O}}:\quad\quad \cdot\overset{\cdot\cdot}{\underset{\cdot}{S}}:\quad\quad \cdot\overset{\cdot\cdot}{\underset{\cdot}{Se}}:
b. These elements are sequential elements in Period 2 of the periodic table; B is in Group IIIA (three valence electrons), C is in Group IVA (four valence electrons), and N is in Group VA (five valence electrons). The Lewis symbols for these elements are
\quad\quad\quad \cdot\overset{\cdot}{\underset{}{B}}\cdot \quad\quad \cdot\overset{\cdot}{\underset{\cdot}{C}}\cdot \quad\quad :\overset{\cdot}{\underset{\cdot}{N}}\cdot