Carbon-12 is a stable isotope, while carbon-14 is an unstable isotope. Based on thi

Carbon-12 is a stable isotope, while carbon-14 is an unstable isotope. Based on this information, which statement about these isotopes is true?


A. Only carbon-12 can be used to determine the age of ancient artifacts.
B. Only carbon-14 can be used to determine the age of ancient artifacts.
C. The ratio of carbon-12 to carbon-14 can be used to determine the age of ancient artifacts.
D. Both carbon-12 and carbon-14 can be used independently to determine the age of ancient artifacts.

2)Isotopes are atoms that contain the same number of protons but a different number of neutrons in their nuclei. Based on this information, which statement about isotopes is true?


A. Isotopes are atoms of the same element.
B. Isotopes are atoms that have the same mass number.
C. Isotopes are atoms of different elements that have similar chemical and physical properties.
D. Isotopes are atoms of different elements that belong to the same family on the periodic table.

3)Which form of radiation has the greatest penetrating ability?


A. beta radiation
B. alpha radiation
C. visible radiation
D. gamma radiation

4)Which material will stop gamma rays if it is at least ten centimeters thick?


A. lead
B. wood
C. water
D. aluminum

5)A sample of pure sodium-24 has an initial mass of 10.0 grams. How many grams of sodium-24 will remain at the end of 4 half-lives?


A. 0.315
B. 0.630
C. 5.00
D. 6.00

B
A
D
A
B

1...B.
2...A.
3...D.
4...A.
5...B.