A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes

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Question 38
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This question is about historic models of the atom.

Two historic models of the atom. Model Alpha shows a sphere of positive charge containing randomly embedded negative electrons. Model Beta shows a tiny positive nucleus in the center with electrons orbiting in defined paths around it, leaving a large amount of empty space.

a.

Name the models of the atom shown in the figure above.

[2]
b.

Compare Model Beta with Model Alpha. Refer to the structure, charge distribution, and location of mass in both models.

[4]
c.

In 1932, James Chadwick discovered a new subatomic particle.

Name this subatomic particle.

[1]
d.

Explain how the discovery of this particle helped scientists understand isotopes.

[2]

A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes Questions

  1. GCSE
  2. /Chemistry
  3. /A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes