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Bellwork‐
atomic
structure
Fill
in
the
chart
 Subatomic          Location      Charge   Mass
 particle           (in or ou...
25.1   Lecture 25.1- Nuclear Radiation

Marie Curie was a Polish
scientist whose research
led to many discoveries
about ra...
25.1



Marie Curie (1867-1934) and Pierre Curie
(1859-1906) were able to show that rays
emitted by uranium atoms caused f...
25.1



Marie Curie (1867-1934) and Pierre Curie
(1859-1906) were able to show that rays
emitted by uranium atoms caused f...
25.1



Marie Curie (1867-1934) and Pierre Curie
(1859-1906) were able to show that rays
emitted by uranium atoms caused f...
25.1
 Nuclear reactions differ from chemical
reactions in a number of important ways.
25.1
 Nuclear reactions differ from chemical
reactions in a number of important ways.

• In chemical reactions, atoms tend...
25.1
 Nuclear reactions differ from chemical
reactions in a number of important ways.

• In chemical reactions, atoms tend...
An unstable nucleus releases energy
by emitting radiation during the
process of radioactive decay.
An unstable nucleus releases energy
by emitting radiation during the
process of radioactive decay.

An unstable nucleus is...
25.1



   The three main types of nuclear
   radiation are alpha radiation, beta
   radiation, and gamma radiation.
25.1
Alpha radiation consists of helium
nuclei.
25.1
Alpha radiation consists of helium
nuclei.
  These particles, called alpha
  particles, contain two protons and
  two...
25.1
Alpha radiation consists of helium
nuclei.
  These particles, called alpha
  particles, contain two protons and
  two...
25.1


An electron resulting from the
breaking apart of a neutron in an
atom is called a beta particle.
25.1


Carbon-14 emits a beta particle as it
undergoes radioactive decay to form
nitrogen-14.
25.1
25.1
25.1
25.1
25.1
25.1
25.1


A high-energy photon emitted by a
radioisotope is called a gamma ray.
Gamma rays are electromagnetic
radiation.
25.1


A high-energy photon emitted by a
radioisotope is called a gamma ray.
Gamma rays are electromagnetic
radiation.
25.1


A high-energy photon emitted by a
radioisotope is called a gamma ray.
Gamma rays are electromagnetic
radiation.



...
25.1
  Alpha particles are the least
  penetrating.
  Gamma rays are the most
  penetrating.
particle     Alpha α           Beta β            Gamma γ
Mass         4amu              ≈0                0
Charge       +...
Damage from nuclear radiation is due
to ionization of living tissue.
Damage from nuclear radiation is due
  to ionization of living tissue.

Nuclear radiation is called ionizing
radiation bec...
Damage from nuclear radiation is due
  to ionization of living tissue.

Nuclear radiation is called ionizing
radiation bec...
25.1 Section Quiz.
1. Certain elements are radioactive
   because their atoms have
  a. more neutrons than
     electrons....
25.1 Section Quiz.
1. Certain elements are radioactive
   because their atoms have
  a. more neutrons than
     electrons....
25.1 Section Quiz.

2. An unstable nucleus releases energy by
  a. emitting radiation.

  b. thermal vibrations.

  c. a c...
25.1 Section Quiz.

2. An unstable nucleus releases energy by
  a. emitting radiation.

  b. thermal vibrations.

  c. a c...
25.1 Section Quiz.
3. Which property does NOT describe
   an alpha particle?
  a. 2+ charge

  b. a relatively large mass
...
25.1 Section Quiz.
3. Which property does NOT describe
   an alpha particle?
  a. 2+ charge

  b. a relatively large mass
...
25.1 Section Quiz.
4. When a radioactive nucleus releases a
   high-speed electron, the process can be
   described as
  a...
25.1 Section Quiz.
4. When a radioactive nucleus releases a
   high-speed electron, the process can be
   described as
  a...
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Lecture 25.1- Radiation

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Section 25.1 lecture for Honors & Prep chemistry

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Lecture 25.1- Radiation

  1. 1. Bellwork‐
atomic
structure Fill
in
the
chart Subatomic Location Charge Mass particle (in or out of nucleus) Proton Neutron Electron
  2. 2. 25.1 Lecture 25.1- Nuclear Radiation Marie Curie was a Polish scientist whose research led to many discoveries about radiation and radioactive elements. In 1934 she died from leukemia caused by her long-term exposure to radiation. You will learn about the various types of radiation and their effects.
  3. 3. 25.1 Marie Curie (1867-1934) and Pierre Curie (1859-1906) were able to show that rays emitted by uranium atoms caused fogging in photographic plates.
  4. 4. 25.1 Marie Curie (1867-1934) and Pierre Curie (1859-1906) were able to show that rays emitted by uranium atoms caused fogging in photographic plates. • Marie Curie named the process by which materials give off such rays radioactivity.
  5. 5. 25.1 Marie Curie (1867-1934) and Pierre Curie (1859-1906) were able to show that rays emitted by uranium atoms caused fogging in photographic plates. • Marie Curie named the process by which materials give off such rays radioactivity. •The penetrating rays and particles emitted by a radioactive source are called radiation.
  6. 6. 25.1 Nuclear reactions differ from chemical reactions in a number of important ways.
  7. 7. 25.1 Nuclear reactions differ from chemical reactions in a number of important ways. • In chemical reactions, atoms tend to attain stable electron configurations by losing or sharing electrons.
  8. 8. 25.1 Nuclear reactions differ from chemical reactions in a number of important ways. • In chemical reactions, atoms tend to attain stable electron configurations by losing or sharing electrons. • In nuclear reactions, the nucleus gains stability by undergoing changes.
  9. 9. An unstable nucleus releases energy by emitting radiation during the process of radioactive decay.
  10. 10. An unstable nucleus releases energy by emitting radiation during the process of radioactive decay. An unstable nucleus is called a radioisotope.
  11. 11. 25.1 The three main types of nuclear radiation are alpha radiation, beta radiation, and gamma radiation.
  12. 12. 25.1 Alpha radiation consists of helium nuclei.
  13. 13. 25.1 Alpha radiation consists of helium nuclei. These particles, called alpha particles, contain two protons and two neutrons and have a double positive charge.
  14. 14. 25.1 Alpha radiation consists of helium nuclei. These particles, called alpha particles, contain two protons and two neutrons and have a double positive charge.
  15. 15. 25.1 An electron resulting from the breaking apart of a neutron in an atom is called a beta particle.
  16. 16. 25.1 Carbon-14 emits a beta particle as it undergoes radioactive decay to form nitrogen-14.
  17. 17. 25.1
  18. 18. 25.1
  19. 19. 25.1
  20. 20. 25.1
  21. 21. 25.1
  22. 22. 25.1
  23. 23. 25.1 A high-energy photon emitted by a radioisotope is called a gamma ray. Gamma rays are electromagnetic radiation.
  24. 24. 25.1 A high-energy photon emitted by a radioisotope is called a gamma ray. Gamma rays are electromagnetic radiation.
  25. 25. 25.1 A high-energy photon emitted by a radioisotope is called a gamma ray. Gamma rays are electromagnetic radiation. Gamma ray emission does not change the element.
  26. 26. 25.1 Alpha particles are the least penetrating. Gamma rays are the most penetrating.
  27. 27. particle Alpha α Beta β Gamma γ Mass 4amu ≈0 0 Charge +2 -1 0 Effect on loses two converts a loses energy nucleus protons and two neutron to a The element neutrons proton & ejects does not change The an electron ELEMENT The ELEMENT changes changes What it is Helium nucleus electron High energy electromagnetic radiation Stop it Paper/skin 1cm/metal foil Lead/concrete damage High ionization Medium Lowest ionization ionization
  28. 28. Damage from nuclear radiation is due to ionization of living tissue.
  29. 29. Damage from nuclear radiation is due to ionization of living tissue. Nuclear radiation is called ionizing radiation because it produces ions from neutral molecules.
  30. 30. Damage from nuclear radiation is due to ionization of living tissue. Nuclear radiation is called ionizing radiation because it produces ions from neutral molecules. Alpha radiation has a low penetration, but it is the most damaging to living tissue because it deposits all its energy along a short path.
  31. 31. 25.1 Section Quiz. 1. Certain elements are radioactive because their atoms have a. more neutrons than electrons. b. an unstable nucleus. c. a large nucleus. d. more neutrons than protons.
  32. 32. 25.1 Section Quiz. 1. Certain elements are radioactive because their atoms have a. more neutrons than electrons. b. an unstable nucleus. c. a large nucleus. d. more neutrons than protons.
  33. 33. 25.1 Section Quiz. 2. An unstable nucleus releases energy by a. emitting radiation. b. thermal vibrations. c. a chemical reaction. d. giving off heat.
  34. 34. 25.1 Section Quiz. 2. An unstable nucleus releases energy by a. emitting radiation. b. thermal vibrations. c. a chemical reaction. d. giving off heat.
  35. 35. 25.1 Section Quiz. 3. Which property does NOT describe an alpha particle? a. 2+ charge b. a relatively large mass c. a negative charge d. low penetrating power
  36. 36. 25.1 Section Quiz. 3. Which property does NOT describe an alpha particle? a. 2+ charge b. a relatively large mass c. a negative charge d. low penetrating power
  37. 37. 25.1 Section Quiz. 4. When a radioactive nucleus releases a high-speed electron, the process can be described as a. oxidation. b. alpha emission. c. beta emission.
  38. 38. 25.1 Section Quiz. 4. When a radioactive nucleus releases a high-speed electron, the process can be described as a. oxidation. b. alpha emission. c. beta emission.

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