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Chapter 2 Pre-Test sections 2.1-2.7

Rutherfords gold foil experiment showed that a the

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9. Rutherford's gold foil experiment showed that _______. a. the "plum-pudding" model of the atom was incorrect b. most of the mass of an atom is concentrated in a tiny portion of its total volume c. the positively charged particles within an atom are concentrated in a tiny portion of its volume d. α -particles are less massive than gold nuclei e. all of these are correct 10. There are _____ electrons, _____ protons, and _____ neutrons in an 132 atom of 54 Xe. 11. Which isotope has 45 neutrons? 12. Which isotope has 36 electrons in an atom?
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13. Which of the following are not subatomic particles? a. x-rays b. protons c. neutrons d. electrons e. All of these are subatomic particles 14. The nucleus of an atom does not contain _______. 15. Different isotopes of a particular element contain the same number of _______. 16. In the symbol below, x = _____. x C 6 17. Which one of the following basic forces is so small that it has no chemical significance? a. weak nuclear force b. strong nuclear force c. electromagnetism d. gravity e. Coulomb's law 18. Gravitational forces act between objects in proportion to their
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