Answer:
lead
Explanation:
Lead was once widely used in the United States as a gasoline additive.
Addition of lead is in the form of tetra ethyl lead(II).
It helps to improve the octane rating of gasoline and to produce more useful energy via each combustion step.
- The compound containing lead was banned due to the huge health risk it poses to people.
- Lead poisoning is a known defect that affects people.
- When the gasoline is combusted, it releases lead as a by-product.
- Exposure to a high level of lead can cause brain damage and kidney failure.
