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

Answer:

B. $2\mathrm{Na}^{+1}\left[\ddot{\mathrm{O}}\vdots\vdots\right]^{-2}$

Explanation:

Step1: Analyze sodium oxide formula

Sodium oxide is $\mathrm{Na}_{2}\mathrm{O}$. Sodium ($\mathrm{Na}$) has a +1 charge as an ion ($\mathrm{Na}^{+}$) and oxygen ($\mathrm{O}$) has a - 2 charge as an ion ($\mathrm{O}^{2 -}$).

Step2: Check ion - to - ion ratio

For a neutral compound, two $\mathrm{Na}^{+}$ ions are needed to balance the - 2 charge of one $\mathrm{O}^{2 -}$ ion. Option B shows two $\mathrm{Na}^{+}$ ions and one $\mathrm{O}^{2 -}$ ion which is consistent with the formula $\mathrm{Na}_{2}\mathrm{O}$.

Step3: Evaluate other options

Option A has only one $\mathrm{Na}^{+}$ ion which cannot balance the - 2 charge of $\mathrm{O}^{2 -}$. Option C is a wrong representation as it does not show the ionic nature with proper charges and brackets for the anion.