1.1.8 Size and Mass of Atoms

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Cards (4)

  • State the relative atomic masses and relative charges of the proton, neutron and electron.
    Masses: proton - 1, neutron - 1, electron - very small; Charges: proton - 1, neutron - 0, electron - -1.
  • Explain why atoms are electrically neutral.
    They have the same number of electrons and protons.
  • What is the radius of an atom?
    0.1 nm.
  • What is the radius of a nucleus and what is it compared to that of the atom?
    1 x 10^-14m and 1/10000.