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Atoms & Radiation

Atoms & Radiation. March 4 th 2014 Mr King. Exam Paper Review. P2.2 Question 3 P2.2 Question 4 Exam technique Any other questions?. Mind Map Review. Please review your mind map from last lesson Add anything you learnt last lesson How does this link in to what you previously knew?

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Atoms & Radiation

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  1. Atoms & Radiation March 4th 2014 Mr King

  2. Exam Paper Review • P2.2 Question 3 • P2.2 Question 4 • Exam technique • Any other questions?

  3. Mind Map Review • Please review your mind map from last lesson • Add anything you learnt last lesson • How does this link in to what you previously knew? • Is there anything else you can add?

  4. Last Lesson… • The plum pudding model • Rutherford scattering experiment • What were the observations? • What were the conclusions? • What is the basic structure of the atom? • What are the relative masses of each part? • What are the relevant charges of each part?

  5. You should have moved on to… • Ions – What are they? • Isotopes • What stays the same? • What changes? • What is the atomic number? • What is the mass number?

  6. Ions • When an atom loses an electon it becomes a positively charged ion • When an atom gains an electron it becomes a negatively charged ion • Only the electrons move

  7. Isotopes

  8. Isotopes • The atoms of a particular element all have the same number of protons. • Isotopes are the atoms of an element with different numbers of neutrons • They have the same proton number but different mass numbers

  9. How Radioactive are you?

  10. Power Stations in the East Midlands

  11. Alpha • Alpha radiation consists of Alpha particles • An Alpha particle is identical to the nucleus of a helium atom. • It consists of two protons and two neutrons.

  12. Beta • Beta radiation consists of high energy electrons emitted from the nucleus • These electrons have not come from the electron shells or energy levels • They form when a neutron splits into a proton and an electron • The electron then shoots out of the nucleus at high speed.

  13. Gamma • Short wavelength • High frequency • Electromagnetic radiation • Similar to other types of EM radiation such as X-Rays and visible light which can travel long distances.

  14. Radiation Research • What are the properties of each type of radiation? • What is the most penetrating, what is the least? • What uses are there for each type of radiation, what are the dangers? • What happens when each type of radiation passes through a magnetic field?

  15. Nuclear Equations

  16. Alpha Decay • Two protons and two neutrons are lost from a nucleus when it loses an alpha particle • Radon decays into polonium when it loses an Alpha particle • On the left you can see the equation for this Alpha decay

  17. Beta Decay • In Beta decay, a neutron changes into a proton plus an electron • The proton stays in the nucleus • The electron leaves as a high energy Beta particle • The nucleus has one more proton and one less neutron when it emits a Beta particle.

  18. Past Exam Questions

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