Download Name Date Period 21-2 Radioactive Decay Match the following

Name
Date
Period
21-2 Radioactive Decay
Match the following terms with their definitions:
1.
2.
3.
4.
5.
6.
7.
the spontaneous disintegration of a
nucleus into a slightly lighter nucleus,
that releases particles and/or radiation
particles or electromagnetic radiation
emitted from the nucleus during
radioactive decay
an unstable nucleus that undergoes
radioactive decay
A. daughter
nuclide
B. decay series
C. half-life
D. nuclear
radiation
the time required for half the atoms
of a radioactive nuclide to decay
E. parent nuclide
a series of radioactive nuclides produced
by successive radioactive decay until a
stable nuclide is reached
the heaviest nuclide of each decay series
F. radioactive
decay
G. radioactive
nuclide
nuclides produced as a decay series
progresses
8.
When does a decay series end?
9.
occurs when nuclei are
bombarded with charged and uncharged particles.
10.
All of the elements with more than
are radioactive.
11.
These elements are referred to as
protons in their nuclei
elements.
Match the following properties with the type of radiation
A.
alpha particle
D.
B.
beta particle
E.
C.
gamma radiation
F.
or particle described:
neutron
positron
all of these
12.
has no effect on atomic number or mass number
13.
4
symbolized by 2 He because it resembles a helium nucleus
14.
has the effect of increasing atomic number when emitted
15.
travel at the speed of light
16.
decreases the atomic number by 2 and atomic mass by 4 when
emitted
17.
emitted when a neutron is converted into a proton and an
electron
18.
usually emitted immediately following other types of decay
when the nucleus is left in an excited state
19.
emitted by unstable nuclei below the band of stability
20.
emitted by unstable nuclei above the band of stability
Solve the following problems. Show all your work.
21.
22.
The half-life of plutonium-239 is 24,110 years. Of an original mass of
100. g, how much plutonium remains after 96,440 years?
1
16
Exactly of a given amount of protactinium-234 remains after 26.76
hours. What is the half-life of protactinium-234?