What is the geometry around the central atom in the following molecular model of NH2-? 
Definitions:
Consumer Surplus
The variance between the actual cost paid by consumers and the maximum amount they're prepared to pay for a good or service.
Market Equilibrium
The point at which the quantity of a good or service demanded by consumers equals the quantity supplied by producers, resulting in a stable market price.
Price Ceiling
A government-imposed limit on how high a price can be charged for a product or service to prevent market prices from rising above a certain level.
Consumer Surplus
The variation between the price consumers are willing to offer for a product or service and the actual payment made.
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