which model represents the ionic compound sodium oxide, na2o? a. na+1o-2 b. 2na+1o-2 c. na:o:na

Brief Explanations:

In sodium oxide ($Na_2O$), sodium ($Na$) has a +1 charge and oxygen ($O$) has a - 2 charge. To balance the charges, two sodium ions are needed for each oxide ion. Option B shows two sodium ions ($2Na^+$) and one oxide ion ($O^{2 -}$) in the correct ionic - bonding representation. Option A has only one sodium ion which does not balance the charge of the oxide ion. Option C is a wrong representation as it shows covalent - like bonding instead of ionic bonding.

Answer:

B. $2Na^+\left[\begin{array}{ccc}\cdot&\cdot&O\\cdot&\cdot&\cdot\\cdot&\cdot&\cdot\end{array}\right]^{2 -}$