In the following pictures representing binary hydrides AHx,lightly-shaded spheres represent H atoms or ions and darkly-shaded spheres represent atoms or ions of the other element,A. 
-The binary hydride shown in picture (1) is classified as
Definitions:
Average Cost
The cost per unit of output, calculated by dividing the total cost of production by the number of units produced.
Marginal Cost
The additional cost incurred in producing one more unit of a good or service.
Variable Cost
Costs that change in proportion to the level of production or sales activity of a business.
Total Cost
The overall expense incurred in the production of goods or services, including both fixed and variable costs.
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