Lesson 3.3

Question 1

any method of measuring the age of an object in years

Answer 1

absolute dating

Question 2

an atom that has the same number of protons(or the same atomic number) as other atoms of the same element but that has a different number of neutrons(and thus a different atomic mass)

Answer 2

isotope

Question 3

the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element

Answer 3

radioactive decay

Question 4

another name for an unstable isotope

Answer 4

radioactive

Question 5

a method of determining the age of an object by estimating the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope

Answer 5

radiometric dating

Question 6

an unstable radioactive isotope

Answer 6

parent isotope

Question 7

the stable isotope produced by the radioactive decay of the parent isotope

Answer 7

daughter isotope

Question 8

the time needed for half of a sample of a radioactive substance to undergo radioactivedecay

Answer 8

half-life