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Except for 1H and 3He, all nuclei having fewer ______________ than ______________ are radioactive.
United States
A country in North America consisting of 50 states and a federal district, known for its significant influence on world economy, politics, and culture.
Depressions
Extended periods of significant decline in general economic activity, usually marked by severe drops in GDP, high unemployment, and deflation.
March 1933
A significant month during the Great Depression in the United States, marked by President Roosevelt's Bank Holiday and the beginning of New Deal policies.
Banks
Financial institutions that accept deposits from the public, lend money, and offer various other financial services.
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