Lead Has 4 Stable Isotopes with Masses of 203

question 73

Multiple Choice

Lead has 4 stable isotopes with masses of 203.973 (1.48%) ,205.9745 (23.6%) ,206.9759,and 207.9766 respectively.What are the percentages of the last two isotopes?

• A)77% and 23%
• B)50% and 50%
• C)37% and 38%
• D)64% and 11%
• E)24% and 50%

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Definitions:

Pairs

Two things considered together because of similarity, opposition, or adjacency; often used in context to describe complementary items or concepts.

Marginal Cost

The outlay for creating another unit of a product or service.

Economies of Scale

Cost advantages that enterprises obtain due to their scale of operation, with cost per unit of output generally decreasing with increasing scale.

Output

The total amount of goods or services produced by a company, industry, or economy within a specific period.