4.4. THOMSON'S MODEL OF ATOM
which
Rutherford in 1911 and hence was rejected.
out by
Positive sphere
©
Electron
FIGURE 4.7. Thomson's model of atom
question arises how these negative and positive charges are distributed within the atom, J. J. Thomson, in
to maintain electrical neutrality of the atom, positive charges were also present within the atom, The
1904, proposed that an atom was a sphere of positive electricity in which were embedded number of electrons
seeds were embedded or with a pudding containing currants (dry fruits). This model of atom is called
sufficient to neutralize the positive charge (Fig. 4.7). This may be compared with a water melon in
Thomson's model. However, it could not explain the results of the scattering experiments carried
Now, it had been well established that atom contains negatively charged particles (i.e., electrons) and
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