Topic # 2.1 – 2.4
GPS: 1a, 3a-d
Name: ______________________
Unit 2 Review Sheet
Date: ___/____/____ Per: ___
Across
6. negative subatomic particle
7. positively subatomic particle
9. unstable nuclei emit energy in the form of ___
16. weighted average mass of the mixture of its isotopes
17. nuclei of two small atoms combine, releasing energy = nuclear ___
19. sum of the number of protons and neutrons in the nucleus = ___ number
22. nucleus of a large atom splits and two smaller atoms are formed,
releasing energy = nuclear ___
24. on a half-life T-chart, the amount of time passing is ___ on each row on
the left column
26. radioactive decay process that results in a daughter particle with 1 more
proton than the original isotope
28. neutral subatomic particle
29. alpha radiation is the ___ penetrating form of radiation
30. the smallest piece of matter that still retains the properties of the
element
Down
1. an atom of the same element that has a diff. number of neutrons is
called an ___
2. element with 74 protons (element name)
3. number of protons in an atom’s nucleus = ___ number
4. one-___ of a sample of radioactive material remains after 2 half-lives
have passed
5. these subatomic particles have approximately the same mass as
neutrons
8. one-eighth of a sample of radioactive material
remains after ___ half-lives have passed (spell out
the number)
10. lithium-6 and lithium-7 are two ___ of lithium
11. element with 25 protons (element name)
12. the number 34 in sulfur-34 is called the ___ number
13. radioactive decay process that travels in waves
14. on a half-life T-chart, the amount of original isotope
is ___ by 2 on each row on the right column
15. amount of time it takes for 50% of an unstable nuclei
to decay
18. required to produce power in a nuclear power plant
20. electrons are found in the ____
21. lithium-6 and lithium-7 have a different number of
___ in the nucleus
23. center of an atom
25. element with 53 protons (element name)
27. radioactive decay process that results in a daughter
particle with 2 less protons than the original isotope
SPS1. Students will investigate our current understanding of the atom. a. Examine the structure of the atom in terms of proton, electron, and neutron locations, atomic mass and
atomic number, atoms with different numbers of neutrons (isotopes), and explain the relationship of the proton number to the element’s identity. SPS3. Students will distinguish
the characteristics and components of radioactivity. a. Differentiate among alpha and beta particles and gamma radiation. b. Differentiate between fission and fusion. c.
Explain the process half-life as related to radioactive decay. d. Describe nuclear energy, its practical application as an alternative energy source, and its potential problems.
PS
Directions: Fill in the table below with the appropriate information.
Name of Isotope
Symbol
(don’t forget the mass number!)
Atomic Number
Mass Number
# of Neutrons
# of Protons
gallium-67
31
lithium-7
3
60 Cr
24
cobalt-___
59
potassium-40
27
19
rubidium-87
37
___ H
3
uranium-235
92
uranium-___
238
tin-120
15 N
59 Fe
Directions: Write a full alpha and beta decay equation for each isotope below. Use the example below as a guide.
115
49
In 
111
47
Ag + 42 He
115
49
:
In 
115
50
Sn +
0
-1
e
Ex: indium-115
:
1.
niobium-93
:
___
___
___  ___
___ ___ +
___
___
___
:
___
___
___  ___
___ ___ +
___
___
___
2.
potassium-40 :
___
___
___  ___
___ ___ +
___
___
___
:
___
___
___  ___
___ ___ +
___
___
___
3.
xenon-129 
:
___
___
___  ___
___ ___ +
___
___
___
:
___
___
___  ___
___ ___ +
___
___
___
4.
carbon-14   :
___
___
___  ___
___ ___ +
___
___
___
:
___
___
___  ___
___ ___ +
___
___
___
Directions: Answer the questions involving half-life below. Use T-charts to help you analyze the decay rate.
1. Gold-198 has a half-life of 2.7 days. How
much of a 96 g sample of gold-198 will be
left after 8.1 days?
2. If the half-life of tantalum-181 is 17.2 days,
how long will it take a 120 g sample to
decay to 3.75 g?
3. Potassium-42 has a half-life of 12.4 hours.
How much of an 848 g sample of potassium42 will be left after 62.0 hrs?
STUDY ALL YOUR UNIT 2 NOTES AND
FUNSHEETS (2.1 – 2.4) FOR THE TEST!
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30.
added on a half-life T-chart, the amount of time passing is ___ on each row on the left column
alpha radioactive decay process that results in a daughter particle with 2 less protons than the original isotope
atom the smallest piece of matter that still retains the properties of the element
atomic number of protons in an atom’s nucleus = ___ number
averageatomicmass weighted average mass of the mixture of its isotopes
beta radioactive decay process that results in a daughter particle with 1 more proton than the original isotope
chainreaction required to produce power in a nuclear power plant
divided on a half-life T-chart, the amount of original isotope is ___ by 2 on each row on the right column
electron negative subatomic particle
electroncloud electrons are found in the ____
fission nucleus of a large atom splits and two smaller atoms are formed, releasing energy = nuclear ___
fusion nuclei of two small atoms combine, releasing energy = nuclear ___
gamma radioactive decay process that travels in waves
halflife amount of time it takes for 50% of an unstable nuclei to decay
iodine element with 53 protons (element name)
isotope an atom of the same element that has a diff. number of neutrons is called an ___
isotopes lithium-6 and lithium-7 are two ___ of lithium
least alpha radiation is the ___ penetrating form of radiation
manganese element with 25 protons (element name)
mass sum of the number of protons and neutrons in the nucleus = ___ number
massnumber the number 34 in sulfur-34 is called the ___ number
neutron neutral subatomic particle
neutrons lithium-6 and lithium-7 have a different number of ___ in the nucleus
nucleus center of an atom
proton positively subatomic particle
protons these subatomic particles have approximately the same mass as neutrons
quarter one-___ of a sample of radioactive material remains after 2 half-lives have passed
radiation unstable nuclei emit energy in the form of ___
three one-eighth of a sample of radioactive material remains after ___ half-lives have passed (spell out the number)
tungsten element with 74 protons (element name)
actinides group of the PT that is mostly synthetic (group name)
alkali very reactive metals = ___ metals (group name)
alkalineearth lose 2 valence electrons to form an ion = ___ metals (group name)
aluminum element that has 10 electrons after forming a +3 ion (element name)
beryllium element at the top of the column that loses 2 valence electrons while forming an ion
bromine element that has 36 electrons after forming a -1 ion (element name)
calcium element that has 18 electrons after forming a +2 ion (element name)
carbon element at the top of the column that can gain OR lose valence electrons while forming an ion
eight valence electron number of argon (spell out the number)
four valence electron number of carbon (spell out the number)
group elements that have similar properties are classified as a ___ (there are 10 of these on the PT)
halogens very reactive nonmetals (group name)
hydrogen element that is located on top of a group it does not belong to (element name)
iodine halogen located in period 5 (element name)
lanthanides top row of bottom 2 rows on PT (group name)
magnesium alkaline-earth metal located in period 2 (element name)
Mendeleev made the first periodic table (last name)
metalloid zig-zag line on the PT = ___ line
metalloids have properties of both metals and nometals (group name)
Moseley arranged elements by atomic number (last name)
neutral if an atom has the same number of protons and neutrons it is electrically ___
nitrogen element that has 10 electrons after forming a -3 ion (element name)
noblegas elements lose/gain electrons to “look” like a ___ (group)
noblegases most non-reactive elements on the PT (group name)
nonmetals poor conductors of heat, electricity, brittle, crystalline (group name)
one valence electron number of rubidium (spell out the number)
oxygen element at the top of the column that gains 2 valence electrons while forming an ion
period a horizontal row in the periodic table is called a ___
potassium alkali metal located in period 4 (element name)
seven valence electron number of the halogens (spell out the number)
six valence electron number of oxygen (spell out the number)
tellurium metalloid that loses 2 electrons to form an ion (element name)
transition shiny, can be drawn into wires, good conductors of heat, electricity = ___ metals (group name)
two valence electron number of the alkaline-earth metals (spell out the number)
valence electrons in the outer energy level of an element are called ___ electrons