In the following picture of an oxide,darkly-shaded spheres represent oxygen atoms or ions and lightly-shaded spheres represent atoms or ions of a third-row element in its highest oxidation state.Tell whether the oxide is covalent or ionic and whether the oxide is acidic or basic. 
Definitions:
Allocative Efficiency
Refers to a market situation where resources are apportioned in the most efficient manner, allowing for the optimal combination of goods and services production to meet consumer preferences.
Consumer Surplus
The variance between the aggregate sum consumers are prepared and capable of spending for a product or service and the aggregate sum they end up paying.
Producer Surplus
The difference between the amount producers are willing to accept for a good or service and the actual amount they receive following trade.
Marginal Benefit
The boost in pleasure or utility a person gets from purchasing one more unit of a product or service.
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