Question

1. which of the following best describes why different isotopes of the same element have unique properties? a) variations in proton count b) variations in neutron count c) variations in electron configuration d) variations in atomic weight 2. in radiometric dating, the half - life represents: a) the total time an isotope exists b) the time required for half of the parent isotope to decay into daughter isotopes c) the rate of radioactive particle emission d) the total mass of radioactive material 3. why can carbon - 14 dating not be used to determine the age of very ancient rocks? a) carbon is not stable in rocks b) its half - life is too short for rocks older than 50,000 years c) protons interfere with decay measurements d) rocks do not contain sufficient carbon 4. stable isotope ratios can provide insights into paleoclimate by: a) directly measuring temperature b) tracking mass - dependent fractionation processes c) counting neutron variations d) calculating radioactive decay rates 5. what phenomenon causes isotope fractionation in natural systems? a) electrical charge differences b) quantum mechanical interactions c) mass - dependent processes

Explanation:

1. Isotopes of an element have the same number of protons but different numbers of neutrons, which gives them unique properties.
2. The half - life in radiometric dating is the time it takes for half of the parent isotope to decay into daughter isotopes.
3. Carbon - 14 has a relatively short half - life of about 5730 years, making it unsuitable for dating rocks older than about 50,000 years.
4. Stable isotope ratios can provide paleoclimate insights by tracking mass - dependent fractionation processes.
5. Mass - dependent processes cause isotope fractionation in natural systems.

Answer:

1. B. Variations in neutron count
2. B. The time required for half of the parent isotope to decay into daughter isotopes
3. B. Its half - life is too short for rocks older than 50,000 years
4. B. Tracking mass - dependent fractionation processes
5. C. Mass - dependent processes