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Introduction to Atoms: Understanding the Smallest Particle

Learn about the fundamental particles that make up atoms, including protons, electrons, and neutrons. Explore the history of atom discovery from Democritus to Bohr and understand key concepts in atomic structure.

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Introduction to Atoms: Understanding the Smallest Particle

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  1. Introduction to Atoms

  2. What is the smallest particle into which an element can be divided and still be the same substance? • A. electron • B. neutron • C. proton • D. atom

  3. What is the smallest particle into which an element can be divided and still be the same substance? • A. electron • B. neutron • C. proton • D. atom

  4. How did the Greek Democritus describe atoms? • A. large, soft particles • B. small, hard particles that were dividable. • C. small, hard particles-like a tiny marble • D. large, hard particles

  5. How did the Greek Democritus describe atoms? • A. large, soft particles • B. small, hard particles that were dividable. • C. small, hard particles-like a tiny marble • D. large, hard particles

  6. If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have? • A. 92 • B. 95 • C. 143 • D. 146

  7. If an isotope of uranium, uranium-235, has 92 protons, how many protons does uranium-238 have? • A. 92 • B. 95 • C. 143 • D. 146

  8. Which of the following is the smallest subatomic particle and has the least mass in the atom?? • A. nucleus • B. proton • C. neutron • D. electron

  9. Which of the following is the smallest subatomic particle and has the least mass in the atom?? • A. nucleus • B. proton • C. neutron • D. electron

  10. An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of • A. 39 • B. 158 • C. 197 • D. 276

  11. An atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of • A. 39 • B. 158 • C. 197 • D. 276

  12. In Thomson’s “plum pudding” model of the atom, the plums represent • A. atoms • B. protons • C. neutrons • D. electrons

  13. In Thomson’s “plum pudding” model of the atom, the plums represent • A. atoms • B. protons • C. neutrons • D. electrons

  14. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common? • A. They each identified new elements. • B. They each identified new isotopes of atoms. • C. They each discovered something about what we know about atoms today. • D. They each were born in Greece..

  15. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common? • A. They each identified new elements. • B. They each identified new isotopes of atoms. • C. They each discovered something about what we know about atoms today. • D. They each were born in Greece.

  16. The sum of protons and neutrons in an atom • A. Atomic number • B. Mass number • C. Atomic mass unit (amu) • D. Electron cloud

  17. The sum of protons and neutrons in an atom • A. Atomic number • B. Mass number • C. Atomic mass unit (amu) • D. Electron cloud

  18. The number of protons in the nucleus of an atom • A. Isotope • B. Atomic number • C. Atomic mass unit (amu) • D. Mass number

  19. The number of protons in the nucleus of an atom • A. Isotope • B. Atomic number • C. Atomic mass unit (amu) • D. Mass number

  20. Particle that cannot be cut according to Democritus. • A. atom • B. nucleus • C. isotope • D. proton

  21. Particle that cannot be cut according to Democritus. • A. atom • B. nucleus • C. isotope • D. proton

  22. Region where electrons are likely to be found • A. electron cloud • B. nucleus • C. isotope • D. proton

  23. Region where electrons are likely to be found • A. electron cloud • B. nucleus • C. isotope • D. proton

  24. Atoms that have the same number of protons but different numbers of neutrons • A. proton • B. electron • C. isotope • D. neutron

  25. Atoms that have the same number of protons but different numbers of neutrons • A. proton • B. electron • C. isotope • D. neutron

  26. Subatomic particle that has a positive charge • A. neutron • B. electron • C. isotope • D. proton

  27. Subatomic particle that has a positive charge • A. neutron • B. electron • C. isotope • D. proton

  28. Negatively charged particle discovered by J J Thomson • A. nucleus • B. electron • C. proton • D. atom

  29. Negatively charged particle discovered by Thomson • A. nucleus • B. electron • C. proton • D. atom

  30. Particle in the center of an atom that has no charge • A. neutron • B. nucleus • C. isotope • D. electron

  31. Particle in the center of an atom that has no charge • A. neutron • B. nucleus • C. isotope • D. electron

  32. A unit of mass that describes the mass of an atom or molecule. • A. atomic number • B. atomic mass unit (amu) • C. mass number • D. electron cloud

  33. A unit of mass that describes the mass of an atom or molecule. • A. atomic number • B. atomic mass unit(amu) • C. mass number • D. electron cloud

  34. Central region of the atom • A. isotope • B. proton • C.nucleus • D. electron

  35. Central region of the atom • A. isotope • B. proton • C.nucleus • D. electron

  36. Who proposed this model of an atom? • A. Bohr • B. Thomson • C.Rutherford • D. Democritus

  37. Who proposed this model of an atom? • A. Bohr • B. Thomson • C.Rutherford • D. Democritus

  38. Introduction to Atoms Nice to have met you…

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