PPT Slide

• Rutherford results:  -atoms are mostly space occupied by electrons; within that  space lies a tiny region called the nucleus. - the nucleus contains all the positive charge and essentially  all the mass of the atom. - positive particles called protons lay within the nucleus.

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• Rutherfordís model explained the charged nature of matter,  but it did not account for all the atomís mass.

• Later, James Chadwick discovered the neutron: an uncharged  massive particle in the nucleus; accounts for the missing mass.

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