• 2022-05-31
    Which of the following is not a valid conclusion from Rutherford’s alpha particle scattering experiment? ( )
    A: The nucleus must be positively charged
    B: The nucleus must be very small compared to the atom
    C: The atom is mainly empty space
    D: The mass of the atom is mostly concentrated in the nucleus
  • A

    内容

    • 0

      The nucleus(原子核) has a diameter(直径) only 0.01% of that of the atom itself.

    • 1

      In 1932, physicists engaged in studying the atom and its nucleus had only three particles to consider: the proton, the neutron ,and the electron.

    • 2

      Nuclear power plants use the forces within the nucleus of an atom to generate electricity. ()generate A: produce B: liquidate C: change D: retard

    • 3

      A syllable must have a nucleus and a ______ .

    • 4

      All syllables must have a nucleus and a coda.