Investigating atoms

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Investigating atoms:

How ideas about atoms have changed-

  • All matter consists of atoms, which cannot be divided.
  • All atoms of the same element are identical, but different from atoms of every other element.
  • In 1897 the electron was disovered, 1909 the nucleus was discovered, 1911 Rutherford suggested that electrons orbit the nucleus, 1919 protons were discovered, and 1932 neutrons were discovered.

Mass number and isotopes:

Properties of isotopes-

  • Not all atoms of an element have the same number of neutrons. Atoms of the same…

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