Chapter 3 Terms

  1. the center of an atom; made up of protons and neutrons
  2. a positively charged subatomic particle in the nucleus of an atom
  3. a neutral subatomic particle in the nucleus of an atom
  4. a tiny negatively charged subatomic particle moving around outside the nucleus of an atom
  5. any of the possible energies an electron may have in an atom
    energy level
  6. a region in an atom where there is a high probability of finding electrons
  7. an electron in the outermost energy level of an atom
    valence electron
  8. properties of elements tend to change in a regular pattern when elements are arranged in order of increasing atomic number, or number of protons in their atoms
    periodic law
  9. a horizontal row of elements in the periodic table
  10. a vertical column of elements in the periodic table
  11. the process of adding electrons to or removing electrons from an atoms or group of atoms
  12. an atom or group of atoms that has lost or gained one or more electronsand therefore has a net electric charge
  13. an ion with a positive charge
  14. an ion with a negative charge
  15. the number of protons in the nucleus of an atom
    atomic number
  16. the total number of protons and neutrons in the nucleus of an atom
    mass number
  17. any atoms having the same number of protons but different numbers of neutrons
  18. a quantity equal to one-twelfth of the mass of a carbon-12 atom
    atomic mass unit(amu)
  19. the weighted average of the masses of all naturally occuring isotopes of an element
    average atomic mass
  20. the elements that are good conductors of heat and electricity
  21. the elements that are usually poor conductors of heat and electricity
  22. the elements hat are intermediate conductors of heat and electricity
  23. the highly reactive metallic elements located in Group 1 of the periodic table
    alkali metals
  24. the reacive metallic elements located in Group 2 of the periodic table
    alkaline-earth metals
  25. the metallic elements located in Groups 3-12 on the periodic table
    transition metals
  26. the highly reactive elements located in Group 17 of the periodic table
  27. the unreactive gaseous elements located in Group 18 of the periodic table
    noble gases
  28. the SI base unit that describes the amount of a substance
  29. the number of particles in 1 mole; equals 6.022x1023/mol
    Avogadro's constant
  30. the mass in grams of 1 mol of a substance
    molar mass
  31. a ratio equal to one that expresses the same quantity in two different ways
    conversion factor
Card Set
Chapter 3 Terms
physical science chapter 3 flashcards