What is the atomic mass (atomic weight) of lead as listed?

Prepare for the EPA Lead Supervisor Test with our study resources. Tackle multiple-choice questions with detailed explanations to boost your understanding. Enhance your exam readiness and ensure your success!

Multiple Choice

What is the atomic mass (atomic weight) of lead as listed?

Explanation:
Atomic weight is the weighted average of all natural lead isotopes, not the mass of a single isotope. Lead has several stable isotopes (with masses around 206, 207, and 208) and their abundances combine to give a standard atomic weight of about 207.2. The value listed on periodic tables reflects this weighted average, so the option near 207 matches the true atomic weight. The other numbers would imply either a single isotope mass or an average far from lead’s natural composition, which isn’t how atomic weight for lead is reported.

Atomic weight is the weighted average of all natural lead isotopes, not the mass of a single isotope. Lead has several stable isotopes (with masses around 206, 207, and 208) and their abundances combine to give a standard atomic weight of about 207.2. The value listed on periodic tables reflects this weighted average, so the option near 207 matches the true atomic weight. The other numbers would imply either a single isotope mass or an average far from lead’s natural composition, which isn’t how atomic weight for lead is reported.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy