In the following drawings,shaded spheres represent cations and unshaded spheres represent anions. 
-Which drawing represents the ionic compound Na2CO3?
Definitions:
Primary Demand
The overall demand for a product category or industry, rather than for a specific brand.
Product Class
A broad category of goods or services that share similar characteristics or serve similar purposes.
Selective Demand
The demand for a specific brand or product rather than the category as a whole, often influenced by advertising and consumer preferences.
Competitors
Entities that operate in the same or similar industry and offer comparable products or services, thereby vying for the same customer base.
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