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Give the relative masses of protons, neutrons & electrons

4B = Section 2 The Structure of Atoms p 119-127 (Question 14-17 will be on 4B quiz, too.) Physical Science 08-09 Curriculum. Give the relative masses of protons, neutrons & electrons. Protons & neutrons have about the same mass;

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Give the relative masses of protons, neutrons & electrons

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  1. 4B = Section 2 The Structure of Atoms p 119-127(Question 14-17 will be on 4B quiz, too.)Physical Science08-09 Curriculum PhSci Ch 4 17 Questions

  2. Give the relative masses of protons, neutrons & electrons • Protons & neutrons have about the same mass; • Electrons are over 1, 000 times smaller (in mass than protons & neutrons).  http://en.wikipedia.org/wiki/File:Atomic_resolution_Au100.JPG PhSci Ch 4 17 Questions 19 slides

  3. Give what defines each element • The number of protons  http://en.wikipedia.org/wiki/Subatomic_particle PhSci Ch 4 17 Questions

  4. Explain why most (unreacted) atoms do not have an overall charge if they are made of charged particles • Most atoms have an equal number • of protons and electrons • whose charges exactly cancel.  PhSci Ch 4 17 Questions

  5. Define ion • an atom • who has gained or lost an electron • and therefore ( ) is charged.  PhSci Ch 4 17 Questions

  6. Explain what holds atoms together • Attractions • between the opposite charges • of protons and electrons  PhSci Ch 4 17 Questions

  7. Explain how different elements have their own unique properties • The atoms • of each type of element • have their own different structure  PhSci Ch 4 17 Questions

  8. Define atomic number • how many protons are in an atom  PhSci Ch 4 17 Questions

  9. Give the largest naturally occurring element and its atomic number • Uranium, • 92  PhSci Ch 4 17 Questions

  10. Define mass number • Tells the number of protons • plus the number of neutrons • in an atom.  PhSci Ch 4 17 Questions

  11. Define isotope • An atom • that has the same number of protons • but a different number of neutrons.  PhSci Ch 4 17 Questions

  12. Define radioisotopes • Unstable isotopes • which emits radiation • and decays into stable forms • (this might take a long time and many steps).  PhSci Ch 4 17 Questions

  13. Define unified atomic mass unit • A quantity used to measure the mass of atoms • (which is equal to 1/12 of a carbon-12 atom) • And is abbreviated u. (Sometimes called an amu)  PhSci Ch 4 17 Questions

  14. Define average atomic mass • average of the mass • of an element’s atoms found in nature • where common isotopes are more important  PhSci Ch 4 17 Questions

  15. Define valence electrons • Electrons in the outer energy level of an atom http://www.chem4kids.com/files/elem_transmetal.html PhSci Ch 4 14 Questions 18 slides

  16. *** Using a periodic table, give the # of protons, neutrons, & electrons of various atoms PhSci Ch 4 17 Questions

  17. *** Calculate atomic number & mass number PhSci Ch 4 17 Questions

  18. *** Write isotopes using the forms given on p 124 (Fig 5 and in the reading) PhSci Ch 4 17 Questions

  19. The end PhSci Ch 4 17 Questions

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