Chapter 20

Question 1

the amount of time it takes for half the nuclei in a same place of an isotope to decay

Answer 1

half-life

Question 2

a radioactive isotope that doctors use to locate molecules in an organism

Answer 2

tracer

Question 3

mass-energy equation:

Answer 3

E = mc2

units of energy = [units of mass(kg)] * [speed of light in a vacuum (m/s)]2

Question 4

a series of repeated fission reactions caused by the release of additional neutrons in every fission

Answer 4

chain reaction

Question 5

the process of changing one element into a different element

Answer 5

transmutation

Question 6

a high-energy electron that is emitted when a neutron decays into a proton

Answer 6

beta particle

Question 7

a particle that is composed of two protons and two neutrons

Answer 7

alpha particle

Question 8

the process of nuclei decaying and emitting matter and energy

Answer 8

radioactivity

Question 9

the force that causes protons and neutrons to be attracted to each other

Answer 9

strong force

Question 10

nuclei that have the same number of protons but different numbers of neutrons

Answer 10

isotopes