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Activity Title: Page 1
240233207
Use your periodic table to answer the following:
Refer to the models provided and a periodic table to answer the following:
Model 1 Model 2
http://library.thinkquest.org/3471/radiation_types_body.html http://www.daviddarling.info/encyclopedia/
http://www.daviddarling.info/encyclopedia/
http://www.hpwt.de/Kern2e.htm
Model 3
http://library.thinkquest.org/3471/radiation_types_body.html
http://www.daviddarling.info/encyclopedia/
http://nothingnerdy.wikispaces.com/RADIOACTIVE+DECAY
Nuclear reactions that involve the decay or formation of a neutron also produce
particles of very little mass and no charge known as neutrinos.
An example equation is shown below:
http://nothingnerdy.wikispaces.com/RADIOACTIVE+DECAY
After decay, a nucleus may still have excess energy that is lost by
emitting electromagnetic radiation of very high energy
known as gamma radiation.
Gamma radiation is very high energy electromagnetic radiation (a high energy photon).
http://outreach.atnf.csiro.au/education/senior/cosmicengine/sun_nuclear.html
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<strong>Nuclear Chemistry: Day 2 </strong>
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<img src="chargeMainIdea.png" width="98" height="58">
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<td>
<p class="subhead">
An Introduction to Positron Emission, e- Capture and Gamma
Radiation
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Check Your Understanding of Alpha and Beta Decay
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Which of the following describes the opposing forces acting in the
nucleus?
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Attractive electromagnetic force between protons and strong repulsive force between protons.
Repulsive electromagnetic force between electrons and strong repulsive force between protons.
Attractive electromagnetic force between protons and strong repulsive force between protons.
Repulsive electromagnetic force between protons and strong attractive force between protons.
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Once atomic nuclei become very large they are considered...
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Unstable and radioactive.
Stable and radioactive
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The basic types of radioactive decay are named...
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for the people credited with discovering each type.
after the first three letters of the Greek alphabet.
after Ernest Rutherford's daughters.
for Marie Curie's three cats.
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An alpha particle is...
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produced by converting a neutron into a proton.
produced by converting a proton into a neutron.
two protons and two neutrons.
electromagnetic radiation.
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In the atom that results from alpha decay...
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the atomic number increases by 2, the mass increases by 4.
the atomic number decreases by 2, the mass decreases by 4.
the atomic number increases by 1, the mass is unchanged
the atomic number decreases by 1, the mass is unchanged.
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A beta particle..
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produced by converting a neutron into a proton.
produced by converting a proton into a neutron.
two protons and two neutrons.
electromagnetic radiation.
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In the atom that results from beta decay...
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the atomic number increases by 2, the mass increases by 4.
the atomic number decreases by 2, the mass decreases by 4.
the atomic number increases by 1, the mass is unchanged.
the atomic number decreases by 1, the mass is unchanged.
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What was the original element if <strong>beta</strong> decay occurred to
produce Pa-234?
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Th-234
U-234
Np-238
Ac-230
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What was the original element if <strong>alpha</strong> decay occurred
to produce Fr-221?
</center>
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Ra-221
Rn-221
Ac-225
Np-229
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What element is produced if Na-24 undergoes <strong>beta</strong> decay?
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F-20
Al-28
Ne-24
Mg-24
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What element is produced if Th-234 undergoes <strong>alpha</strong>
decay?
</center>
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Ra-230
U-238
Pa-234
Ac-234
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Positron Emission
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<img src="positron C11.jpg">
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Using Model 1, identify the differences between C-11 and B-11. Include
the element names, the number of subatomic particles, the atomic number
and the atomic mass for each atom.
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According to Model 2, what happens to a proton during this type of decay?
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The notation e+ denotes a positron. Positrons are also referred to as
"antielectrons". Explain why this term is used.
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When a positron is emitted, how is the mass of the atom affected? Give a
detailed explanation that involves subatomic particles.
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When a positron is emitted, how is the atomic number of the atom
affected? Give a detailed explanation that involves subatomic particles.
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Using the two models above and your response to the previous question,
which of the following best describes what happens during beta decay?
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A proton is converted into a neutron and an e+ is released.
A neutron is converted into a proton and an e+ is released.
An e+ is pulled into the nucleus, combines with a neutron and forms a proton.
An e+ is pulled into the nucleus, combines with a proton and forms a neutron.
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<font size="6">Predict the elements that would be formed through
positron emission of examples A-D: (In the following order, give
the chemical symbol, atomic number, atomic mass, # of protons and
# of neutrons for each example.)</font>
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<img src="Positron Mg.GIF">
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<font size="6">D.</font>
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Example A
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Example B
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Example C
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Example D
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In your own words, describe what happens to any atom after it undergoes
positron emission. Be specific about the region of the atom involved,
the characteristics of the particle released and the characteristics of
the remaining nucleus. (Include protons, neutrons, atomic number and
atomic mass.)
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</p>
<center>
<font size="5">Verify your previous five answers with the
instructor before moving on to the next section. </font>
</center>
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</tr>
</table>
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<p class="subhead">
e- Capture
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<img src="electron capture Be.jpg">
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From Model 3, which of the following is correct?
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Li has 3 protons, 4 neutrons, 4 electrons
Li has 4 protons, 3 neutrons, 4 electrons
Be has 4 protons, 3 neutrons, 4 electrons
Be has 3 protons, 4 neutrons, 4 electrons
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The small arrow at the top of the Be-7 atom shows...
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an e- moving into the nucleus, combining with a p+ to become a neutron.
an e- moving into the nucleus, combining with a neutron to become a p+.
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Which of the following does it appear electron capture is the reverse of?
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Alpha decay
Beta decay
Positron emission
None of the above
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<font size="6">Predict the elements that would be formed through
electron capture of examples A-D: (In the following order, give
the chemical symbol, atomic number, atomic mass, # of protons and
# of neutrons for each example.)</font>
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<font size="6">C.</font>
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<font size="6">D.</font>
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Example A
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Example B
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Example C
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Example D
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What we have referred to as beta decay may also be referred to as
beta-minus decay and positron emission may be called beta-plus decay.
Explain why...
</center>
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<center>
In your own words, describe what happens to any atom after it undergoes
electron capture. Be specific about the regions of the atom involved,
the characteristics of the particle released and the characteristics of
the remaining nucleus. (Include protons, neutrons, atomic number and
atomic mass.)
</center>
</body>
</html>
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<img src="beta decay neutrino.jpg">
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</td>
</tr>
</table>
</body>
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<p>
</p>
<center>
<font size="5">Verify your previous 6 answers with the instructor
before moving on to the next section. </font>
</center>
</td>
</tr>
</table>
</body>
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