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1. The concept of positive charge and a small, “ heavy” nucleus surrounded by electrons

1. The concept of positive charge and a small, “ heavy” nucleus surrounded by electrons was the contribution of Dalton Rutherford (c) Thomson (d) Chadwick. 1. The concept of positive charge and a small, “ heavy” nucleus surrounded by electrons

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1. The concept of positive charge and a small, “ heavy” nucleus surrounded by electrons

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  1. 1. The concept of positive charge and a small, • “heavy” nucleus surrounded by electrons • was the contribution of • Dalton • Rutherford • (c) Thomson • (d) Chadwick

  2. 1. The concept of positive charge and a small, • “heavy” nucleus surrounded by electrons • was the contribution of • Dalton • Rutherford • (c) Thomson • (d) Chadwick

  3. 2. An atom of atomic number 53 and mass • number 127 contains how many neutrons? • (a) 53 • (b) 74 • (c) 127 • (d) 180

  4. 2. An atom of atomic number 53and mass • number 127 contains how many neutrons? • (a) 53 • (b) 74 (127-53) • (c) 127 • (d) 180

  5. 3. How many electrons are in an atom of 4018Ar ? • (a) 20 • (b) 22 • (c) 40 • (d) no correct answer given

  6. 3. How many electrons are in an atom of 4018Ar ? • (a) 20 • (b) 22 • (c) 40 • (d) no correct answer given • (neutral, p = e- = 18)

  7. 4. The number of neutrons in an atom of • 13956Ba is • (a) 56 • (b) 83 • (c) 139 • (d) no correct answer given

  8. 4. The number of neutrons in an atom of • 13956Ba is • (a) 56 • (b) 83 (139-56) • (c) 139 • (d) no correct answer given

  9. 5.The name of the isotope containing • one proton and two neutrons is • (a) protium • (b) tritium • (c) deuterium • (d) helium

  10. 5. The name of the isotope containing • one proton and two neutrons is • (a) protium11H • (b) tritium31H • (c) deuterium 21H • (d) helium

  11. 6. Each atom of a specific element has the same (a) number of protons (b) atomic mass (c) number of neutrons (d) no correct answer given

  12. 6. Each atom of a specific element has the same (a) number of protons (atomic #) (b) atomic mass (c) number of neutrons (d) no correct answer given

  13. 7. Which pair of symbols represents isotopes? • (a)2311Na and 2312Na • (b) 73Li and 63Li • (c) 6329Cu and 2964Cu • (d) 1224Mg and 1226Mg

  14. 7. Which pair of symbols represents isotopes? • (a)2311Na and 2312Na • (b) 73Li and63Li • (c) 6329Cu and 2964Cu • (d) 1224Mg and 1226Mg

  15. 8. Two naturally occurring isotopes of an • element have masses and abundance as • follows: 54.00 amu (20.00%) and • 56.00 amu (80.00%). What is the • relative atomic mass of the element? • (a) 54.20 • (b) 54.40 • (c) 54.80 • (d) 55.60

  16. 8. Two naturally occurring isotopes of an • element have masses and abundance as • follows: 54.00 amu (20.00%) and • 56.00 amu (80.00%). What is the relative • atomic mass of the element? • (a) 54.20 • (b) 54.40 54.00 (.2000) = 10.80 • (c) 54.80 56.00 (.8000) = 44.80 • (d) 55.6055.60

  17. 9. Substance X has 13 protons, 14 neutrons, • and 10 electrons. Determine its identity. • (a) 27Mg • (b) 27Ne • (c) 27Al3+ • (d) 27Al

  18. 9. Substance X has 13 protons, 14 neutrons, • and 10 electrons. Determine its identity. • (a) 27Mg • (b) 27Ne • (c) 27Al3+ • (d) 27Al

  19. 10.The number of neutrons in an atom of • 10847Ag is • (a) 47 • (b) 108 • (c) 155 • (d) no correct answer given

  20. 10. The number of neutrons in an atom of • 10847Ag is • (a) 47 • (b) 108 • (c) 155 • (d) no correct answer given • (108 – 47 = 61)

  21. 11. The number of electrons in an atom of • 2713Al is • (a) 13 • (b) 14 • (c) 27 • (d) 40

  22. 11. The number of electrons in an atom of • 2713Al is • (a) 13 (neutral, p = e- = 13) • (b) 14 • (c) 27 • (d) 40

  23. 12. The number of protons in an atom of • 6530Zn is • (a) 65 • (b) 35 • (c) 30 • (d) 95

  24. 12. The number of protons in an atom of • 6530Zn is • (a) 65 • (b) 35 • (c) 30 • (d) 95

  25. 13. The number of electrons in the nucleus of • an atom of 2412Mg is • (a) 12 • (b) 24 • (c) 36 • (d) no correct answer given

  26. 13. The number of electrons in the nucleus of • an atom of 2412Mg is • (a) 12 • (b) 24 • (c) 36 • (d) no correct answer given

  27. Free Response Questions 14. What is an ion?

  28. Free Response Questions 14. What is an ion? An ion is a charged atom or group of atoms. The charge can be either positive (“cation” - resulting from a loss of e-) or negative (“anion” – resulting from a gain of e-).

  29. 15. The average mass of a calcium atom is 40.08 amu. Why do we also use 40.08 amu as the average mass of a calcium ion (Ca2+ )?

  30. 15. The average mass of a calcium atom is 40.08 amu. Why do we also use 40.08 amu as the average mass of a calcium ion (Ca2+ )? Electrons have negligible mass compared to the mass of protons and neutrons. The only difference between Ca and Ca2+ is two electrons. The mass of those two electrons is insignificant compared to the mass of the protons and neutrons present (and whose numbers do not change).

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