scar·ci·ty 
(skârsĭ-tē)
(skârsĭ-tē)n. pl. scar·ci·ties
1. Insufficiency of amount or supply; shortage: a scarcity of food that was caused by drought.
2. Rarity of appearance or occurrence: antiques that are valued for their scarcity.
- sodium chloride
- sodium citrate
- sodium cyanide
- sodium cyclamate
- sodium dichromate
- sodium fluoride
- sodium glutamate
- sodium hydrosulfite
- sodium hydroxide
- sodium hypochlorite
- sodium hyposulfite
- sodium lauryl sulfate
- sodium nitrate
- sodium perborate
- sodium peroxide
- sodium phosphate
- sodium-potassium pump
- sodium propionate
- sodium silicate
- sodium sulfate
- sodium sulfide
- sodium sulfite
- sodium thiopental
- sodium thiosulfate
- sodium tripolyphosphate