Problems: The Nuclear Atom

Fill in the missing words:

  1. An alpha . . . . . . . . . . . . . . . . . . is . . . . . . . . . . . . . . . . . -charged and has the same charge and mass as the nucleus of a . . . . . . . . . . . . . . . . . . atom.
  2. Beta . . . . . . . . . . . . . . . . . . are . . . . . . . . . . . . . . . . . -charged electrons travelling at very . . . . . . . . . . . . . . . speed.
  3. Gamma rays are . . . . . . . . . . . . . . . . . . . . . . . . . . . . rays of very short . . . . . . . . . . . . . . . . . . .
  4. Beta . . . . . . . . . . . . . . . . . . are more penetrating than . . . . . . . . . . . . . . . . . . but less penetrating than . . . . . . . . . . . . . . . . .
  5. . . . . . . . . . . . . . . . . . and . . . . . . . . . . . . . . . . . . can be deflected by electric and magnetic fields, but . . . . . . . . . . . . . . . . .
  6. Alpha-, beta- and gamma-rays can be detected by . . . . . . . . . . . . . . . . . film,  a . . . . . . . . . . . . . . . . .  chamber, or
    a . . . . . . . . . . . . . . . . . tube.
    A gold-leaf electroscope or a spark counter can be used to detect . . . . . . . . . . . . . . . . .

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  1. An atom has a small heavy . . . . . . . . . . . . . . . . containing . . . . . . . . . . . . . .  (. . . . . . . . . . . . . . -charged) and . . . . . . . . . . . . . (. . . . . . . . . . . . . .-charged).
  2. A . . . . . . . . . . . . . . and a . . . . . . . . . . . . . . are each about 1800 times the mass of an electron.
  3. The atomic number is the number of . . . . . . . . . . . . . .
  4. The mass number is the number of . . . . . . . . . . . . . .
  5. An isotope has the same number of . . . . . . . . . . . . . . but a different number of . . . . . . . . . . . . . .
  6. The half-life of an element is the . . . . . . . . . . . . . . taken for . . . . . . . . . . . . . . of the atoms to decay.
    After . . . . . . . . . . . . . . half-lives, only one-eighth of the element remains.